I did resolve my rebooting issues recently by doing a hard reset and downloading the beta update via a direct connection and then reloading. As well i changed my config for what i was doing specifically. No probs on its own

.
I did try a few things to see if i could cause it to reboot on its own, and well i was able to make it happen

.
1) I have a third party firewall, so I turned on my windows firewall and by runing two firewalls i was able to cause a conflict with the router.
2) I did have a fluke reboot when I turned off my upnp in dealing with my other networked pc's
Only two things left for you to try or look into. One, check your pc's firewall settings and see how it is sending or blocking packets, you may have to make an adjustment.
Second, is there something that may be interfering with the router?
If you have not updated to the beta update, I would recommend it, second If so try a redownload via a direct linkup and reisntall