Arena Closing after finding opponent for match
This has happened to me a total of three times in the last two weeks or so -- once on the constructed ladder, once in a Premier Draft, and Once in a Traditional Draft. I haven't seen a pattern as to when exactly it happens, but the symptoms were the same each time.
The general framework: I click the play button to join a match. Arena locates my opponent, but closes instead of having me join the match. Reopening Arena causes it to locate the active match, but again close instead of joining it. This continues until I've timed out and lost the match.
The attached files are logs from the most recent incident of this. The 07.17.37 log corresponds to when I first joined the match and had Arena close in me. The 8.21.20, 8.21.39, and 8.23.14 logs correspond to me attempting to reopen Arena, and the 08.24.39 log corresponds to when I was able to get back into Arena.