Game restarts after ads

Hello! I have video ads in my game on android and when I click on it i go to play market (google play) as usual, but when i want to get back to my game using icon, the game restarts… It happens only after ads, if i try to get back to game without ads, it goes normally. Help please!

Maybe opening the Play Store requires too much memory for your phone and forces the system to exit the game.