Same problem over here, got the phone 3 days ago, 3 random reboots (jet not 15 times)…opened a ticket. 
Had almost given away my old phone, maybe i should keep it till the fairphone is ready as a daily driver.
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Just try first to use a third Party lock screen… There is a known bug in the changing colours oft the lock screen plus the power saving in processor. For me, after doing so, I had the first nicht without a reboot…
It Amy not solve all the causes, but the once wäre it reboots without any user interaction…
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Has this been listed as a bug? I hadn’t seen it anywhere. The overnight reboots are annoying but I’d prefer they fixed the random ones that occur when you are interacting with the phone.
What bug are you talking about? Did I miss something?
Or are you referring to the simple fact that the colors of the lock screen change? This is default behavior and intended, as it shows the stage of battery discharge.
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I remember issues with at least the mood background for very early versions of the operating system of the Fairphone 1. The Fairphone 2 being affected would be news to me.
Anyway: apparently an update is on the way, but Fairphone is looking for tech-savvy volunteers to test the update first. I’m mentioning it here as it specifically looks for people experiencing random reboots. If the description below isn’t warning enough, do realise that things do go wrong in test versions - though if you can explain fastboot and ADB to an 8-year old you will know this anyway.
(Click through to the topic for details on how to apply if interested)
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Hi every one
I use waze everyday cause am working on road. Fp2 reboot several times a day. Average every 10 minutes.
I use my fp2 with waze connected to car alim
Its very disturbing …
Am gonna use back m’y old phone if they r is no issues for that. 
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Really annoyed with this issue - erratic rebooting makes an expensive phone at best into an annoyance and at worst into an unusable waste of resources. I wouldn’t mind if there was some form of official communication about this, but currently, without this customer care, I’m just left thinking that I’ve been sold an expensive dud by a company that doesn’t care.
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I know it is a long thread - so it is easy to oversee, but here’s a statement from FP on the issue:
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Fortunately, my old phone (a half broken Samsung Galaxy S3) used to reboot about as often as my new FP2…
So overall still a big improvement for me (same number of reboots, but it reboots much faster 
)
I’ve very seldom had this reboot issue - till now
Starting today, every time someone trys to call me, the FP2 reboots. This behavior is reproducable. I’m not able to get calls anymore.
Does someone else face this strange behaviour?
I think that’s my problem… When using software with a huge memory extension like Google Maps… or something else.
Arghhh! This is my second FP2… and here we go again… Random reboots in the middle of me writing a (long) message which was not saved… and the crazy screen!!! It’s tiring…and frustrating…
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OK I’m this close to changing phones… When I got my FP1 I got a working phone! apart from the trouble re-installing GAPPs after every update, it worked!
Now with the FP2 I have bug after bug, I can’t rely on it for anything… just know it decided to get completely blocked on a black screen. Had to take the battery out and now it’s updating every apk…
This is no good, this is no good at all! 
sick and tired… I just want a phone that works!!!
I sent an email, waiting for the answer…
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Hi All, may be I’ve a solution for a few of you FP2 users. As stated above, my FP2 was no longer able to get phone calls (of course i could make call, but not receive). Every time someone tried to call me the FP2 rebooted.
After thinking what has changed I thought it has to do with the fact, that I changed the ringtone. The location of the new ringtone was at sdcard1/Ringtones
I then moved it to the proimary sdcard (sdcard/Ringtones) and - luckily - all works well again.
Probably the one or other faces the same behaviour and changed the location to the second sdcard (sdcard1).
Hope this will help, at least for a few users.
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This brings back an old memory: I once had huge issues with my old phone rebooting randomly for no apparent reason. When I managed to take logs of one reboot (it was rooted so I could use the Syslog app, see https://play.google.com/store/apps/details?id=com.tortel.syslog) I found that it had trouble accessing my SD card. I changed the card and never had trouble with reboots anymore. So, can you guys find anything in common in whether you use an SD card and/or which brand/model? I haven’t had reboot problems, but I don’t have an SD card installed either.
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Mine just did the same. I was adding a contact and then tried calling that contact when it froze. Then the grey screen and the world ‘loading’. I had to take the battery out and then replace to restart android. Currently waiting as it optimizes apps
I have had the random reboots pretty much since day one. I don’t have a second sd card installed nor do I have a second sim card, so fix listed in the software issue report likely doesn’t cover my situation. At first it didn’t bother me so much because it was only one time a day, but when i use the phone more heavily, the reboots get more frequent. Once I had three reboots in the span of one hour.
The real deal breaker for me are the reboots when I am not at my phone. The phone has rebooted itself once overnight, and once when I had it on my desk and hadn’t noticed. In both instances the phone disconnected from the mobile network and I was effectively unreachable for several hours, without even noticing it. I have written an email to support, waiting to see how they respond.
I only had a few reboots that stopped completely when I switched 4G off. But in order to be connected even if the phone reboots, I disabled the SIM PIN, so it connects automatically again without me doing anything, and set a general PIN for the phone instead. Not a solution, but a workaround…
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