I've had multiple reconnection issues in the last couple weeks. I reported the one from my quick draft as it affected me financially. I just had a disconnection again on a standard play game (not ranked) with the same issue:

I was disconnected from the game (network connection may be to blame, unsure) and the application said reconnecting to server. When finished it shot me back to the home screen. Attempting to start a new game fails until your current game times out, no option to rejoin the game in progress. I was able to close the client, restart, then press play to rejoin the game in progress.

This seems to be a widespread problem with the windows client, not just isolated to a specific format or game type. It was present prior to the current update and persists. Log capture attached.

I think there needs to be a rejoin button somewhere on the home or play menu that shows whenever there is a match in progress, or even an unfinished event where this issue didn't occur.