Glitches after IOS update

Platform, device version and operating system:
Ipad air, Iphone SE IOS 12.1.1
Screenshot or image:

What you were expecting to happen, and what actually happened:
After i had downloaded the newest IOS i got some visual gliches, and my game quit frequently, i have the same issue on my Iphone as well.

This is simply what you were trying to do and what happened instead. Example:
I was doing pvp and explore.

How often does this happen? When did it begin happening?
Nearly every 30 minutes the game exit. The visual gliches apper randomly. ( some photos i have on my phone, i uploadet it in a comment.)

Was this a once-off bug or has it been a consistent issue? Does it only happen after doing a particular game mode?

No it is not realeted to one mode

Thanks: Corvus

Photo from my phone:

Hey there, please see this article for help!