Is it really essential to get a new device?
Basically, I was getting hammered in act 5.3 with a device that's 2 year old. Lags, crashes and what not. I couldn't even do one path of 5.3.1 without my team getting wiped before reaching mordo.
Bought a new device and completed act 5 in one go, no retries, just 5 revives and some pots. In your experience (on Android specifically) , does it really make a difference?