I've been having problems with my Pandora app on my Droid Razr, and the same with my Droid 3 before that. It would play maybe a song or two, and then Pandora would shut down.
I tried everything:
Uninstall/reinstall....battery pull....clear cache....it would happen through 3G, 4g and WIFI. Even a factory re-set (ouch...not recommended unless you enjoy extreme pain)
I contacted Pandora, Verizon and Motorola.....zilch, nobody had an answer.
I had an epiphany this morning. Are you ready? Are you sitting down?
Here's what worked for me:
If you have Pandora on the auto-end list.....remove it. It's that simple.
It's been working like a charm for me now.
Hope this helps!
I see you figure the solution because this was what I was thinking would have been the issue... Its always wise to add all apps that needs to stream or play media to the exclusion list to avoid it being auto closed..
Glad you got it resolved...