Temperature was a factor for my car.
My 2014 P85DL started acting up summer 2018. Weekly loading errors for streaming audio, intermittent (non-patterned) GPS failure unrelated to 3G connection status, slow downloads of updates, and inconsistent app connection. It appeared to be fine in Fall 2018 but started flaking out again in early 2019 (right after warranty expired). More of the problems above but the instrument cluster (IC) would randomly not come on. I learned to reboot and didn't think much of it but then it started happening more often in Spring 2019 and then almost daily in the Summer. When I scheduled service, I got a tech call where they told me to do reset my trip odometer, but then he also noted "your car is doing way too much logging." After a service, they said they could replace the MCU (out of pocket) or I could just reboot when it happens. I went the cheap route. Then it freaked me out in September when for the first time the IC went out while I was driving. It would work again when I rebooted but that was a little bit disconcerting because I would just be cruising along on Autopilot and it would disengage AP and go dark. (Someone in a thread was saying it isn't a safety issue . . . that's a safety issue). The vast majority of my problems occurred when the outside temp was 80+ or the ambient temperature in the car was high . . . although I did have a few failures in the past 2 months when it was not.
A ranger service in November likely did the double firmware update. The IC would still fail on occasion but it was less frequent . . . but it was also cooler. The other thing I noticed was that the MCU would boot per norm but the IC would take much longer to boot. I even rebooted the car a couple of times when I didn't need to because I thought the IC wasn't going to come on. Last Friday, I was driving home on AP when the MCU switched to the T logo. Everything still worked (I think) just no display. When I came to an intersection, I rebooted and the MCU went dark and the media stopped. I tried to reboot again and the steering controls no longer worked (no reboot). The heated seats and HVAC still work but remain on the same setting. It's been like that since then. The battery discharges at just over 1% per hour. It drives fine and Supercharges (but only displays percentage, it does not show rate), but virtually all MCU functions are gone. Curiously, the app connects better now than it has in the past 6 months.
