I'm also having the same problem with my 200vwr. Randomly disconnects about 10 times during a day.
On my previous router the, 105wr I also experienced disconnects but only 2 or 3 times a week.
How can I check if the problem is the router or the line itself?
Hey, it ended up being my NIC driver. I use Win7, and tried going to the device manager and going into network card properties and there is an option to revert back to an older driver. I did that and it worked fine. I'm still using the modem, but my motherboard blew and I got a replacement, works fine still.
It would help if you had a spare router, to test.