Question Internet dropping out.

Feb 18, 2024
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My set up is as follows -
From ONT direct to Sage mcomm Fast 5374 Router.

Router port 1 to Work PC - PC says no internet connection but will run off WiFi . Still available unable to connect to to LAN unless router and/or PC is restarted.
Port 2 to Power line adapter to PC in other room - PC loses LAN internet intermittently and does not have wifi - windows diagnostics says "Your DNS server is not responding- detail - Your computer is trying to use a DNS server that is incorrect or does not exist.
Port 3 to 8 port HIKVision internet switch to TV, PC(3), Set top box, Wifi access point (TP Link ac 1200 upstairs), PS4 and PS3. All devices lose internet intermittently except PS4 and 3 which i don't use and haven't had complaints about.
Port 4 to TV(2)

Have no idea why this is occurring - any ideas?

Steven