This was happened with me before 2 weeks, when I opened a Torrent program like utorrent, bittorrent,, the internet connection completely stop (Connection icon turned to yellow triangle) and its not back to normal until I reboot both my PC and router.
Methods I tried to solve my problem:
Disable firewalls, add port forwarding in the router, formatting my computer, changing the Internet company!! , I googled my problem (no solutions)
non of those previous methods was useful.
Please help me with my issue.
PC specf. Windows 7 Ulti x64 - 8GB DDR2 - Core 2 Quad Q8400