Experiencing odd disconnects while playing with Mumble

[Onbeatable]

So I've recently joined a new a guild that uses Mumble.
I've never used it before so I downloaded it.
Somehow WoW and Mumble aren't a great combination on my computer it seems: as soon as Mumble disconnects, WoW disconnects mere seconds later. I thought it was an ISP issue at start, but I don't believe this anymore and here's why:

The first evening of raiding I had 0 disconnects, everything working as it should.
The second evening of raiding I had around 8 disconnects over 3,5 hours.
I thought it had to do with my ISP, but since that raid I did like 20 dungeons, without any disconnects, and without using Mumble.

I just finished a raid again just now, and I had 5 disconnects.
I looked up the time of the disconnects on Mumble:
-19:15.00
-19:30.04
-19:45.07
-21:45.31
-22:00.40

What's so odd about this is that the disconnects are exactly on :00, :15:, :30, :45.

I'm going crazy with this, since I'm still a trial and I'm not making a very good impression with all the DCs.
Does anyone have a clue?

[lloose]

Open a command prompt and type in
"Ping www.google.com" -t

Conduct business as usual. When you disconnect, check this window. If you see timeouts, you are losing packets. If this is the case, do the same thing only replace www.google.com with the IP address of your gateway. Mine is 192.168.11.1. If you disconnect and still see the time outs, it's something between your computer and your router.

[Onbeatable]

Thanks for your reply.

I will definitely use this if I haven't fixed it by tomorrow.

Anyone else with another possible solution?