Phone: Moto G (1st gen). Online and offline mode.

Since last week or so (perhaps since the last update), the spotify app for android has been being auto-killed regularly, especially when I try to do anything else on the phone. I never used to have any issues but now I can only listen without doing anything else. It also happens much more frequently when I have no signal (underground) unless I turn on airplane mode. Does the latest update cause much more cpu/memory use to cause android to auto-kill it to try to do something more important?

I've also noticed recently (about the same time) that tracks will often play without sound - the track timer moves forwards but I get no sound unless I skip to another track.

Anybody else experienced this, are there known issues/fixes for this?