For a month or so now I've been having problems with a Windows 10 computer randomly, sometime about mid day, losing internet access. Usually, after a few hours of frustrating rebooting the PC, the router, the modem and doing everything I can think of, it randomly starts working again.
I've diagnosed, tracked, traced and fiddled with it every time it happens. I tried different routers, I even bought a new Netgear router. I've talked to my ISP. Nothing.
When the problem occurs, everything else on my network keeps working. Just my PC. So I know it's in the PC. But, everything at the IP level seems to work. I can ping the router. Through the router and even through to the outside world. I finally tracked it down to DNS not responding to requests.
Finally, today when the problem happened, it occurred to me to disable Avast, so I right clicked on the Avast icon, went to Avast Shield control and disabled them all for 10 minutes. I instantly had DNS access again. I had an NSLOOKUP instance running and connected to 8.8.8.8. And, my browser started working immediately also.
I turned all the shields back on and everything kept working. I'll have to wait for tomorrow (or the next day's) random failure to test it again.
Windows 10 Home 64-bit Version 1809 Build 17763.437
HP Notebook - 17-by0062cl
Avast Free Antivirus 19.4.2374 (build 19.4.4318.460)
It was happening on an earlier build also. I know it's updated at least once or twice since this problem started.
