Actually unreal that there are still constant crashes and pvp disconnects in this game. I am about ready to give up the game completely for good. ADDRESS THE TOPIC! SHOW THAT YOU ARE WORKING ON IT! This is the most frustrating gaming experience i have ever had.
Another satisfied BLIZZARD customer 
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You’re on track, keep telling them stuff they know and have 0 interest in fixing.
They’re making money… That is all that matters…
KEEP YOUR OPINIONS TO YOURSELF!
YOU DON’T MATTER!
JUST SHUT UP AND KEEP SPENDING MONEY DAMN IT.
Are you using iPhone with 32gb storage? Apple auto-crashes apps that go beyond memory allocation thresholds that are based on percent, so you would need 64gb or larger to avoid the crashing/disconnects from downloading until better memory management from the game can be implemented to avoid going over the memory threshold cap of 32gb devices.
If you are using more than 32gb already, the next issue would be the age of the device, because memory can only write a certain number of times before it begins failing.
Hope this helps with figuring out why.