If a router ever gets overwhelmed then that has to be the worst router I've ever heard of. I've seen speed degrade from them but not overwhelm and disconnect random connections. It is a good idea to test directly to one computer that has been dropping though and see the results. 80% of the time the media (cable) you use is the problem. You rule out many factors plugging it in and if it doesn't drop move backwards with one computer at a time.