This is a common glitch with android players atm & there is no known fix for it. The only thing I can suggest is delete unwanted apps as low memory space does affect game play. Other than the only thing you can do is submit a ticket to the developers by Clicking Here
There is a post regarding this on the forums already Click Here to view thread
Sorry I can't be of more help but I Hope your issue is resolved promptly
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There is a post regarding this on the forums already Click Here to view thread
Sorry I can't be of more help but I Hope your issue is resolved promptly