This is going in different directions. The difficulties of last night and today are an issue SE is aware of. It's affecting a number of people. In my early Expert roulette the tank DCed twice and a DPS DCed once. This, as others noted, is a known issue, but it's not on SE's end.

However, that was last night and today. If you've been having consistant connection issues for a month, that is something entirely different, and not something most players have been experiencing. The advise regarding contacting your ISP is a valid one.