I get that a lot on my S5 as well. I'll go in to edit a deck and I'll be halfway through and suddenly the game just closes and restarts :( I get no lag, no crashes, butter smooth while everywhere else.
It's frustrating because you lose all of your changes as well, and making a deck on mobile takes a while.
It keeps doing it and I don't know why.
Are you using OS X?
There have been some issues since the latest patch. a Blizzard CM has posted some temporary work-around fixes you could try for this here:
http://www.hearthpwn.com/blue-tracker/topic/13775-game-crash-when-opening-decks-in-collection-manager
I get that a lot on my S5 as well. I'll go in to edit a deck and I'll be halfway through and suddenly the game just closes and restarts :( I get no lag, no crashes, butter smooth while everywhere else.
It's frustrating because you lose all of your changes as well, and making a deck on mobile takes a while.
Oh man. I have a really similar problem.
T1- Innervate, Coin, Astral Communion
T2- Deathwing
T3- GG
Seems Legit