sansa c240 won't stay on

my just bought c240 plays for 10 min, then shuts down, this means i have to re-start it, find the podcast, or whatever i was playing, and begin at the beginning again. Very annoying. Can anyone help? Thanks

happens everytime? what if you format and reload your music

yes, it happens every time, in hold or no-hold, and also while listening to radio broadcast, however i will try reformating as suggested

got ot Menu > Settings > Power and make sure you avhe Sleep turned off.