Hi Ilan.
OK... your game closes under the following circumstances on my phone.
Airplane mode ON or OFF makes no difference
Start a game and continue playing. Does not matter if I successfully complete a level or not (run out of time), if I keep playing it eventually stops
Start a game, move some pieces and then just stop playing - again it eventually stops.
Start and complete a game, then leave it at the 'Victory' screen - again it eventually stops.
No on-screen Crash message - it just stops and I am presented with my phones Home screen
My app, which is a service that monitors sms messages, also stops, but mine displays a '{myApp} has stopped working' message
Does your game create any logs that I may be able to find and send to you?. You mention above that you "have not received any crash reports, and also not on my google play console." Are those reports ones that your app would produce and upload? If so then where would I locate them (I have no experience in those).
At this point, as you have not had any other reports like this, then it may not be worth pursuing.