Hi muel,
I'm glad to see I'm not the only one who had this problem.
Yesterday, one of my SNGs froze up in the middle of the game, even though my internet connection was fine and I was even playing a few more tables that worked without any problems. None of the other players at the table seemed to have the same problem, since I learned later on that I was blinded out at 4th place.
Just about an hour ago, I finished another six-tabling session, and three of the tournaments were affected (one of them twice).
I have contacted Pokerstars' customer support about the first incident last night. They responded quickly and refunded my buy-in for the tournament. This is what they wrote:
We can confirm that PokerStars has recently experienced some technical difficulties on the site. However, these issues have been resolved now and normal play has resumed.
Unfortunately, it seems like the issue still persists.
Were you playing SNGs as well, or did it happen during a cash game?