This is just ridiculous. I have the same problem, and I'm very angry about this, has it happenned multiple times, without warning, completely at random. Sometimes, I'm on the bus riding to work, listening music trough Poweramp since a good 30 min without any problem and bam, it just stops playing songs in the proper order, and when I try to open Poweramp, it says it can't validate or something like that. Trying to revalidate through Google Play doesn't work (option is greyed out). I have to manually uninstall and reinstall the unlocker from Google Play EVERY TIME this bug happens, which is, I would say, about once a week since about 2 months. THIS IS RIDICULOUS. SERIOUSLY. I don't have a data plan, thus, I can't uninstall and reinstall from Google Play when Poweramp decides to stop working randomly in the middle of the day and I don't have wi-fi access. I'm not the one who usually complains about bugs, but this is just unacceptable. If it was a one-time bug that never happenned again, I wouldn't complain. But it happens about AT LEAST once EVERY WEEK for god's sake. And totally at random too... usually right in the middle of a music playing session... I'm not running on custom roms and I am not one of those guys who thinker with his system. I like when my stuff just work. THIS IS A FREAKING MUSIC PLAYER. That's one of those apps you think would be a reliable, no-nonsense piece of software that would JUST WORK. Seriously. The developper should fix this NOW. This is BEYOND ridiculous. I used to rely on this piece of software for my music EVERY DAY. Now I just can't. I never know when it's going to stop working. Running on a Nexus 4, with Android 4.4.4. I'm this close to shopping for a new music player. It's sad though, because this one had a lot of nice features, but it's totally UNRELIABLE. Stops working randomly requesting a valid licence that I already bought and reinstalled many, many, many times already. I'm fed up with this. Anyway, I can guarantee you the next time this happens to me (probably next week), I'm going to uninstall this piece of ?%"/$*"% and look for something else. Never saw a paid app that made me angry like this one (and I installed a lot of apps on both iOS and Android). That's just sad.