ok, this is by FAR the oddest routing, network, dns issue I have ever seen I am totally pondering by it! a few months ago I got my new RT-n66u and updated with the 64k tomato hack by shibby. I have two main computers at home my nas and my game pc both on windows 8 (don't say it… I KNOW).
Here is my issue if i shut down my game PC i can no longer logmein to my nas or utorrent or any outside network hell even local shit I cant access! utorrent via my phone by local IP or my airplay it app via IP not dns and not ip-no.org dns! the moment i turn pc on everything is up again.. I don't even have to be in windows everything starts to work while on post! I have cleared my router and reinstalled many times I know there is something in the router setting that's causing this. I could see why my dns would stop working but logmein should of not been stopped and that also goes down. wtf is blocking my network? all I am doing is shutting down my PC that's it!!!!!! I used to have dmz on, and removed it. changed ip and change my mac on wan and nothing.
Btw I also have at&t uverse but the issue is my router not at&t, i changed ports on router and same issue! it's like my router somehow detects my pc does up and wam shuts it self off and turns back on when i turn pc on.