New Firmware Creates browser issues

Any help is appreciated!  

I updated firmware just over a week ago to v1.0.4.118  and ever since every computer on my network often gets a "Can't find webpage" or similar message.  Doesn't matter if it is Chrome, Edge or Firefox.   In Chrome, it goes to the error page and half a second later it loads properly.  Edge and Firefox it doesn't autoreload, you have to click try again.

I have tried resetting both cable router and my wireless router. Have tried clearing caches, etc.  on computers, no avail.   I am consistently getting download speeds in the 120-150 mbps and Uploads in the 25-40 mbps so that doesn't seem to be the issue.

Any help is appreciated!