Do you have a sd card in your device?
There's a problem called "Media Scanner," don't know if this is the issue you've been having- however I had it at first. Was able to get rid of it tho!
I had all my music on my SD Card (40GB) and it constantly scanned/ tried to sync.
If this isn't the problem- check to see what services are running, and then you can assess which might be problematic