Can't play wow and online games anymore

[stupidude 0]

Good evening everyone! So I was playing since 2 months with a 3g dongle. Everything worked good but since 2 days impossible to play online games and wow  no more (when I try with I'm stuck at "connecting" like 15 seconds and after that I get disconnected) despite that I can connect to the internett. I tried to change the simcard and use my phone in modem but always the same problem ... Thank you in advance for your help.