I was having this issue as well. I found in another thread that turning off contact sync on your iPhone under the Bluetooth connections eliminates the issue. I tried this and all is well.
Yeah, you could do as DriveCrazy suggests, but I’ve seen lots of remedies posted, none of which accounts for the fact that it’s a known defect and your dealer should be willing to replace the entire enTune unit. It wasn’t until that was done that we solved our constant rebooting issue.I was having this issue as well. I found in another thread that turning off contact sync on your iPhone under the Bluetooth connections eliminates the issue. I tried this and all is well.