When you're using your Zune player, the player restarts on its own.
THINGS TO TRY
To resolve this issue, try one or more of the following solutions:
1. Update your player
When your Zune player is running again, connect it to the computer that has the current Zune software installed, and then update the player to the current player software version. To see if your Zune needs an update:
Click Settings, located at the top of the page.
Click Device, located to the left of the page.
Click Update, located in the list on the left. You'll see whether your player is already updated or how you can update it.
2. Reformat the player software to its factory conditions
When you reformat your Zune player software, all content and the device software is erased and replaced with a fresh installation. To reformat your player to its original state, see the following articles in the Microsoft Knowledge Base:
974593 Steps to reformat your Zune HD player to its factory settings
927001 Steps to reformat your non-touchscreen Zune player to its factory settings
If the methods in the "What To Try" section don't resolve the problem, you can send your Zune in to Microsoft for service if your player qualifies. To do this, visit the following Microsoft webpage to register your player and to submit a request for service: