Same thing happening to me since yesterday. I was playing as usual and then suddenly I heard "session ended". The session time counter stopped counting and no new events were arriving, but I was still playing with no problems. After this I could not get the tracker to track anything, it said I was offline while I was actually online. Yesterday I managed to solve this by doing a manual events update after a lot of reinstalls, but today events update did not solved it yet. I never had this problem before.