Uploading images causes disconnect of internet?

Hiyo, So I have never had issues uploading files to the internet on any site, and yet when I attempt to upload (in any browser) a file greater than ~250kb, my progress bar halts at around that much data transfer and suddenly my entire connectivity is compromised. I have to disable and enable my network adapter to reconnect, but this does me little good in hosting a campaign on roll20 right now. I'd love some advice/guidance! Cheers, Cake

Riley, I've had no luck with drag and drop onto the tabletop and uploading with the upload dialog box also results in failure. However, I am totally able to pull images from both the marketplace and "from the web" - images that are not uploaded by me. My assumption is that this is probably an issue with my network card, but I cannot verify until I try from another PC on my connection. That said, roll20 is the only site where I have discovered this issue.

To close this out, I've verified it was my wireless network card as hardwiring fixes the problem immediately. Thanks for the help, Riley.