I upgraded to SS 5.4 and today used Google Navigation for about an hour. The phone got VERY hot and stopped charging. I have to use my navigation next week for a vacation that will have the phone on for 10 hours and I'm concerned that the phone won't last that long. Any recommended settings to keep the phone running cool? So additional facts: It was mounted on the dash, but had not had this problem before going to SS. The governor is set on Smartass. The screen is set to auto. The phone doesn't run hot when not using navigation.