Still affected me yesterday on build FP4.SP29.B.069.20230510
so leaving it on 4g for now
I have noticed that my FP4 spontaneously reboots from time to time. The first time I have noticed it, I thought I might have a bootloop issue - it was continuously rebooting all the time. Then I have realized that the building had a weak 5G signal inside - I have switched off the mobile internet, and the phone stopped rebooting. Switching it back on sent the phone into a reboot again.
This was a couple of months ago. Since then, I have experienced such behaviour multiply in various locations - all of them had a weak, barely existent - yet existent - signal; typically 5G - but I may be mistaken on this.
The issue does not really bother me: I switch off the mobile internet until I pass the area of poor connection, and everything works well. Although, sometimes it can be an annoyance - e.g., when going on the bus, doing something on the phone, spontaneously searching for something on the internet without paying attention to the connection quality, and getting the phone reboot.
Finally, I cannot claim this has not happened until a few months ago. It may have. From time to time, I get messages to unlock with PIN instead of a fingerprint, for the sake of security. They always come after a reboot (intended or otherwise), and sometimes without a reboot I know of. I remember taking the phone out of pocket previously and being asked to enter PIN, even before I have noticed the unintentional reboots. Therefore, some of these may have been the consequences of unintended reboots that I have not noticed.
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My carrier doesnāt support 5G at all, but Iāve noticed random shutdowns before. Never when Iām at my apartment, always when Iām close to the center of the city where I assume 5G is more popular.
Hmmā¦
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Yes it has been noted, see above.
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I also had the reboot problems on my fp4:
- At the exact same locations the phone suddenly reboots
- When connected to Android Auto, and navigation with waze, suddenly the phone reboots, and causes Android auto in the car to crash also
I disabled 5G 2 weeks ago, and no more reboots. I really think this problem is 5G related.
So, we have a work around for this problem. Hope FP will fix this in the future
Unfortunately the problem is not simply about 5G: Iām using 5G ever since Iāve bought my FP4 (7 months ago), in various places around the country, with good reception, bad reception, reception jumping from 5G to 4G and back again, and I never had any spontaneous reboot (okay, maybe one, but not more) (I do have other issues though, so itās not like I have the perfect FP4ā¦).
What Iām saying is that there must be something specific about some specific base stationsā configuration, as the OP already noticed in his initial post. It would take a Telecom RF specialist to debug this.
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I agree. Itās not like 5G generally causes those problems. But there seem to be combinations that lead to crashes somehow. It is unlikely to be completely in the hands of Fairphone to solve this and will probably need a lot of incremental debugging on multiple ends. So while it might get better and it could be worth to try again every now and then, the problem might not go away completely for a long time.
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Or it might, as suddenly and inexplicably as it arrived, because something was changed on either side and the problematic configuration doesnāt happen anymoreā¦ 
Do you feel lucky?..
Hi!
A long time since my first post on this, and still think some of the comments are pointing to the same idea I had in the beginning: A result of how a certain 5G station are configured very often combined with a weak signal. I am using the swedish operator Telia, from what I know they are mostly using Ericsson equipment in their network. And they do have a very good 5G coverage.
My original problems which occurred in a very specific spot Ā±100 meters, disappeared a few months later. Despite travelling I think I have had no similar issues. Until this month. Been on a different location and visiting a gym where the signal is very weak, sometimes no connectivity at allā¦ And 3 out of 5 times so far the phone has rebootedā¦
Like mde wrote above, donāt think debugging is easyā¦
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Not sure of your hypothesis, because A1 in Austria uses Nokia Equipment for 5G.
My problem was solved apparently after i have factory reset my FP4, because i was at the same places in the last two weeks where reboots occured and didnāt have them since.