The router ended up being the issue. After 3 years it had a hardware failure. I ran the cable from the isp modem directly to the desktop and no drop of signal for 8 hours. I then purchased a new router and hooked it up and it has been 5 days and no issues with any of the 5 devices that work thru the new router. With the defective router I was dropping internet every 15 minutes and getting repeated duplicate ip addresses notices on both my pc's.
Thanks for all the suggestions.