Constantly logged out

I have the app on my phone (Android) and it constantly logs me out. At first it was just between uses of the app which was annoying enough, but now it's logging me out while I'm actively listening to music. Why can I not select any option to stay logged in, or remember my device? Something, anything? I switched to this from Pandora because they started having such bad playback issues and errors I wanted an alternative, and with them I only had to log in if I cleared the cache or was logging into a new device. In other words, almost never. Maybe once or twice a YEAR, but certainly not multiple times a DAY. This is infuriating.