Youtube 5 is always syncing on Android 2

since I updated my YouTube app from the pre-installed version to 5.5.30 on my Android with 2.6 which is running on a Samsung GT I9003, YouTube tries to sync something all the time.

I'm logged in with a YouTube account an can play all the videos without problems. But, YouTube uses most of the battery and the sync icon is always there.

Forcing the app to stop with the task manager sometimes fixes this issue.

Removing the update fixes the problem, but the default version is not really nice.

Any help would be really appreciated!