Ok bro but this might sound retarded, I had a problem with dota2 getting me kicked ingame every single time i found one. I had it for several days and noticed it was SKYPE who fucked up my ports or something. And i never lost my "real" connection to internet cuz i was in skype with my friends while i got dc ingame. This might happen to you too, but with tibia
Solution i did was just close SKYPE (Literally close it) and then it work as long as i dont have skype on. Had it with spotify once too