I think you should contact support. Someone tried to hack the game which rendered in a sudden maintainance. i had weird situation like you but luckily, it did not result in the same way you have.
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Yesterday i am playing lord mobile with no problems then suddenly one message pop up and my screen start flashing after some time i restart tab and when i open lord mobile there is nothing. Is it is a virus? Malware? I reconnect to my gmail acc and the game progress start witg zero. Somebody help me please