My radio head unit/ nav system started to reboot as if the car was turned off/on again - constantly. I found another thread on here with some very helpful information:
Radio / Nav Rebooting
The original post is pretty old, so I'm refreshing the subject in case others are having the same issue.
My head unit held out for 92K miles before having this issue (2015 4Runner Trail). It started to happen a few days ago, and intermittently... the HU turned off/ rebooted after about 10 mins of drive time. The weird thing is that it did it for a day or two, then it stopped, then started back up again. Yesterday we drove around for a few hours and nothing. This morning, it rebooted about 8 or 9 times in the course of 2 hours. As usual, the help on this forum is friggin' AWESOME! You guys and gals all rock. I went to this site:
Toyota Downloads
After a few of the usual prompt questions (year/ model) it led me to the instructions/ download page. You'll need a thumb drive with at least 2GB of free space - preferably blank (per the site instructions). The software version that downloaded for the 2015 4Runner was 0101D7, and the file name I downloaded is 13TDANNA-DA00_0215.kwi
It took maybe 10-15 minutes to upload to the 4runner, and after turning the ignition off/on again, the software was loaded and verified in the general settings tab, under software/ software history. It showed the software and the date uploaded. I'll post again tomorrow night with the results. Fingers crossed.