Help! Constant disconnects

Whenever I am in Dalaran or in any major city , my game runs for like 30-40 seconds and It disconnects me entierly. My whole internet goes off and I have to reset the router.

I tried these solutions which didn't help with my problem ;
1. Flushing my DNS
2. Removing cashe and wtf folder
3. Fresh download the game
4. Running as admin
5. Disabling Read only

Due note that I never had this problem before.
I'm from Bulgaria and I play with friends and it seems like i'm the only one experiencing this problem.