Player turning on and off when trying to access it

I have a relatively new Sansa e250 mp3 player. I was recently deleting old music and adding new music. I was using Real Player to do this and just before the transfer of new music was complete the player shut off then turned back on. It now goes on and off by itself now every time I try to access the player, either with a media program or just by clicking on the media folder on the player itself, in Windows Explorer. Can you help with this?
Tom Gingras