On my desktop PC, I visit various pages on Tumblr, a photo/video sharing community with pages full of thumbnails and animated GIFs. It's a very graphics-intensive site. Unfortunately, after 10 minutes or so of browsing various Tumblr pages and viewing videos and GIFs there, my Internet connection stops. I then reboot and can only view more "regular" pages that have minimal graphics. When I go back to Tumblr, my Internet connection shuts off again after one or two page visits. These problems persist regardless of which browser I use on my desktop. Importantly, I do NOT experience any of these problems when I use my cheap laptop with the same WiFi connection. So, the problem appears to be my desktop, not my WiFi. When I run Performance Monitor on my desktop, my "average" is between 12 to 12.5. Not sure if that means anything.
I have Windows 10 on a Dell XPS 8300 and a 75/75 router. Intel Core i7-2600 3.40 GHz, 12 gigs of RAM, and 64-bit operating system. 1 TB hard drive. My security software is Malwarebytes and MSE (although I use those on my laptop as well, and my connection is always fine there).
Any help would be most appreciated. Thanks!