Question / Help OBS Destroys my Ping?

I have 50 Mbps Down and 30 Mbps UP however once I stream its all good for about 30 minutes and then my ping skyrockets to 300-400 and stays there and after streaming on or off my upload speed is stuck at this now http://www.speedtest.net/my-result/3359318424 until I restart my modem, the fuck?

other info :

i5 4570
EVGA Superclocked gtx 760
8gb ddr3 ram

http://puu.sh/7p6nc.png
http://puu.sh/7p6nJ.png
http://puu.sh/7p6o6.png

To me that sounds like either your ISP throttling your upload speed or a problem with your router/modem

Probably throttling, I'll go ask them about it. I have no router, and my modem is perfectly fine.

After streaming and waiting a bit, speedtests show normal upload speed now

http://www.speedtest.net/my-result/3359634890

THE FUCK IS HAPPENING!?