Connection problems

My first post so be nice =) I got connection problems all the time! I "lost connection to server" and I get "Account in use" and I get kicked back to the character screen all the time! It doesn't matter how long I've played or what cave I'm in. It's starting to get really annoying now when I can't even play cem because I get disconnected after the 2nd boss when trying to enter stage 3. When I try to enter Stage 3 it says something like "invalid portal key". Any fixes? I play on Windows 8 with K-relay and .exe file. I've tried on different servers, I've tried reinstalling K-relay/.exe hacked client, but nothing works!

Bad internet?

Wrong section?