Don't know what a 50 M is, but you might check if you have some sort of sleep feature that enables if you don't change a setting within a given time to make the set think you've fallen asleep so to speak...you may need to turn such a feature off.
"I realize that somebody playing free music isn't as commercial as a hamburger stand. But is it because you can eat a hamburger and hold it in your hand and you can't do that with music? Is it too free to control?" - Don Van Vliet (aka Captain Beefheart) discussing commercial success in the music biz