Since January I have a lot of problems with my connection in GW2. I get a lot of ping spikes and lags all the time, sometimes more severe than other times but its always there. It made the game unplayable for me. Sometimes I disconnect as well. When I do some online internet speed tests, the connection appears to be stable with a low ping. I don't play any other online games on this PC, but on my Xbox (that uses the same connection), I don't have any problems. Before January, the performance in GW2 seemed to be just fine.
Does anyone have an idea on how to find the cause of the problem? Much appreciated.