maintenance message with no maintenance

I seem to get this at least once a day for weeks now, and today I have had it twice within half hour

https://www.facebook.com/photo/?fbid...34965503611044

https://www.facebook.com/photo/?fbid...34965503611044

Hello.

I also have this problem, mostly when I'm in adventure. Get it like 10-20 times/day. When click 'OK' game goes to main menu.
Tried clearing cache, history, different browser, ..

https://prnt.sc/CkRDi202-16c

Thanks for help.