Asicminer Cube causing network problems?

[ITSN]

Hello,
I have a strange problem with my local network in combination with Asicminer Cubes.
This problem suddenly occured, I am running 5 Cubes for about 4 weeks, but this problem happens since ~2 days:
About two days ago I experienced problems browsing the internet with my computer. I got timeouts or websites took ages to load.
When I tried to ping certain websites or IP addresses I also had a bad ping or even got a timeout. Finally I found out that this problem only occurs when a cube is running.
As long as no cube is working everything works fine, but when I switch on the first cube it is getting bad. And it is getting even worse the more cubes are working.
When taking a look at the bfgminer which is working as proxy they only do ~2GH/s so currently I prefer to switch them off.

I did not change any network settings so I am quite confused about this. Everything was running fine for about a month and since two days out of nowhere the cubes stop hashing and I have bad network problems.
Does anyone have an idea about this or is there someone with similar problems?
Greetings

[Karen98]

What operating system?

[Ritual]

Betcha this is Win7 64.

[ITSN]

My computer is Win8 64, but I do not think it is only a local problem with my computer because bfgminer is running on a raspberry pi using minepeon.