I have updated the network card drivers to a newer version, disabled avast firewall, disabled windows firewall, changed utorrent settings to recommended settings on their FAQ which - I had 4x too many connections for my speed tier. It isn't grabbing a new IP, the router stays up rock solid. There is nothing in the event log to coincide with the problem. I have tried resetting tcp/ip, winsock, disabling/enabling network card and dumping the arp cache while running - still ONLY a reboot fixes it. I have rebooted this pc for 1 torrent today about 5 times so far and I have a massive one to get in on next week. If I reboot the pc everything comes back up again for a period of time. Once the download is finished I don't lose the connection again and can start seeding it. Only utorrent DOWNLOADING will cause it to take a complete dump, I can pull down hundreds of gigs over newsgroups successfully with no hiccup and I can seed forever without an issue.

I can log into the pfsense panel from this desktop, and if I ping random new dns addresses it resolves dns but refuses to ping. I can continue to reach this pc from inside the network using rdp, and I can continue to reach my laptop from the internet no issue. If I download a large torrent which is well seeded and really downloads fast my pc will suddenly dump the internet connection ONLY at this pc and ONLY till I reboot. I have been struggling with a VERY strange issue using utorrent on my desktop pc. Windows k machine with 16gb ram and using a pfsense release firewall, gigabit switch.

Utorrent 2.2.1 build 25302 set up proxy