I'm running my Intel 660p in an external enclosure on my Mac and I'm getting terrible write speeds. When I run a speed test on it, it shows 900MB/s at first but then after the 2nd or 3rd test it drops to around 80MB/s but the read speed stays the same. After testing it I tried to transfer 200 GB to the drive. It took around 1 or 2 minutes to transfer the first 90GB to the drive but it took another 15 minutes to transfer the rest of the 110 GB. Has anyone else had this problem?