one issue i know i have since my lolipop updated that when i have the app open and i press the home butten, if i pick the app again from icon screen ital load a new client over whats already logged on, only way to go back to the game after i hit home butten is to use the reciently open app butten to get back to the game that way, if this makes any sence to you
Clearing cache helps avoid this. My phone does the same if I've ran too many apps then closed them out and go back to rscr. It's really hit and miss with it.
If I lock my phone with RSCR open and unlock it, the client is frozen and I have to close it out and reopen it. I always push home button and then lock phone if I'm afk training.