I just played my fourth game in which I placed a stone at the last second, heard the sound and saw the stone on board and then the system suddenly removed the stone from the board and informed me I lost because of timeout. This has been consistently happening to my friends in my region using OGS also.
I have a fairly good internet connection which doesn’t have any problems with streaming 1080p streams and such. Even if this is a ping/speed problem it is unfair that people with worse internet connections should be playing with (e.g. in Blitz mode) ~9 seconds against 10. I really hope this issue is fixed because I love this server.