here's some info from the win update log:CBS called Progress with state=2, ticks=122, total=1000
2016/03/22 17:21:56.7612138 128 2796 Handler CBS called Progress with state=2, ticks=132, total=1000
2016/03/22 17:21:56.7615237 128 2796 Handler CBS called Progress with state=2, ticks=142, total=1000
2016/03/22 17:21:56.7618342 128 2796 Handler CBS called Progress with state=2, ticks=152, total=1000
2016/03/22 17:21:56.7621461 128 2796 Handler CBS called Progress with state=2, ticks=162, total=1000
2016/03/22 17:21:56.7624552 128 2796 Handler CBS called Progress with state=2, ticks=172, total=1000
2016/03/22 17:21:56.7627622 128 2796 Handler CBS called Progress with state=2, ticks=182, total=1000
2016/03/22 17:21:56.7630747 128 2796 Handler CBS called Progress with state=2, ticks=192, total=1000
2016/03/22 17:21:58.2604473 128 2796 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:21:59.2796225 128 2796 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:00.2953419 128 2796 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:01.3027631 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:02.7097733 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:03.7534941 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:04.7657096 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:05.7922957 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:06.8302868 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:07.8842741 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:09.0856392 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:10.0952686 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:11.1785604 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:12.2008632 128 2404 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:13.2425534 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:14.3362943 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:15.3472172 128 7732 Handler CBS called Progress with state=2, ticks=200, total=1000
2016/03/22 17:22:16.2201435 128 7732 Handler CBS called Progress with state=0, ticks=210, total=1000
2016/03/22 17:22:16.2270419 128 7732 Handler CBS called Progress with state=0, ticks=220, total=1000
2016/03/22 17:22:16.2338033 128 7732 Handler CBS called Progress with state=0, ticks=230, total=1000
2016/03/22 17:22:16.2408402 128 7732 Handler CBS called Progress with state=0, ticks=240, total=1000
2016/03/22 17:22:16.2477979 128 7732 Handler CBS called Progress with state=0, ticks=250, total=1000
2016/03/22 17:22:16.2550446 128 7732 Handler CBS called Progress with state=0, ticks=260, total=1000
2016/03/22 17:22:16.2724427 128 7732 Handler CBS called Progress with state=0, ticks=270, total=1000
2016/03/22 17:22:16.3046841 128 7732 Handler CBS called Progress with state=0, ticks=280, total=1000
2016/03/22 17:22:16.3357791 128 7732 Handler CBS called Progress with state=0, ticks=290, total=1000
2016/03/22 17:22:16.9191014 128 7732 Handler CBS called Error with 0x80073712, <NULL>
2016/03/22 17:22:16.9191832 128 7732 Handler CBS called Terminate
2016/03/22 17:22:16.9191889 128 3304 Handler Finished staging package.
2016/03/22 17:22:16.9204659 128 3304 Handler Saved state: cCompleteIterations: 1, pt: Express, nNextRequestID: 1.
2016/03/22 17:22:16.9204702 128 3304 Handler Request generation for CBS update complete with hr=0x80073712 and pfResetSandbox=0
2016/03/22 17:22:16.9204704 128 3304 Handler Error source is 106.
2016/03/22 17:22:22.3783059 128 3304 DownloadManager Download request generation failed with 0x80073712.
2016/03/22 17:22:22.4194160 128 3304 Handler Loaded state: cCompleteIterations: 0, pt: Express, nNextRequestID: 1.
2016/03/22 17:22:22.4874614 128 3304 DownloadManager Error 0x80073712 occurred while downloading update; notifying dependent calls.
2016/03/22 17:22:22.4902540 128 3304 DownloadManager * END * Download Call Complete Call 7 for caller UpdateOrchestrator has completed; signaling completion.
2016/03/22 17:22:22.4907829 128 5672 ComApi *RESUMED* Download ClientId = UpdateOrchestrator
2016/03/22 17:22:22.4907837 128 5672 ComApi Download call complete (succeeded = 0, succeeded with errors = 0, failed = 1, unaccounted = 0)
2016/03/22 17:22:22.4907857 128 5672 ComApi Exit code = 0x00000000; Call error code = 0x80240022
2016/03/22 17:22:22.4907863 128 5672 ComApi * END * Download ClientId = UpdateOrchestrator
2016/03/22 17:22:22.4911258 128 1608 ComApi ISusInternal:: DisconnectCall failed, hr=8024000C
2016/03/22 17:22:22.4928444 128 3304 DownloadManager * END * Begin Downloading Updates CallerId = UpdateOrchestrator
2016/03/22 17:23:29.3207528 128 6740 Agent Earliest future timer found:
2016/03/22 17:23:29.3207616 128 6740 Agent Timer: 29A863E7-8609-4D1E-B7CD-5668F857F1DB, Expires 2016-03-23 16:05:37, not idle-only, not network-only
2016/03/22 17:23:29.3218790 128 6740 Misc CreateSessionStateChangeTrigger, TYPE:2, Enable:No
2016/03/22 17:23:29.3218835 128 6740 Misc CreateSessionStateChangeTrigger, TYPE:4, Enable:No
2016/03/22 17:23:29.3242487 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3242607 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3242698 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3242784 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3242866 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3242952 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243038 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243123 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243206 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243294 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243380 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243462 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243545 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243631 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243716 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243802 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243884 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3243970 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3244053 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3244138 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3244224 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3244309 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.3244392 128 6740 Agent Sending shutdown notification to client
2016/03/22 17:23:29.4417144 128 6740 Shared * END * Service exit Exit code = 0x240001