My player shuts off after 30 min of playing

@stuck,RUBY, With out the model #, I will give a some what generic answer. If under warranty return for repair/replacement/refund. Check to see if anything can be changed in the settings/programming of the player. If nothing in settings, perhaps dismantle the player and give it a good cleaning of dust build up on boards,etc, as the player may be heating up and kicking out. Use a can of compressed air/soft brush carefully to not loosen components and while apart check for loose/damaged/burnt wires/components(bulging capacitors)/bad solder joints. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.