@Razoram: There is a link in the top right corner of the screen that will take you to customer support. It may take a few tries to find the buttons to push to get to the form where you can open a ticket (many choices lead to canned answers).
@FireTiger: If you have serious evidence of hacking or cheating, then click below:
However, I think it’s more likely that something caused your client to bug out and stop responding properly. The fact that it went back to normal after a force quit and restart supports that theory.
If you have screenshots of the board state or an hsreplay.net link, then share them as it might help to understand what caused your client to go rogue.