Could you try the workaround for a loosely fitting battery?
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Just tried it. It seems to work. 
The phone starts with normal speed. It gets a bit warm but not as hot as before.
Thanks a lot!
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A quick update. After applying the new slim case last Saturday I have experienced the reboot problem that same Saturday and the day after (Sunday). Yesterday (Monday) no reboot and today so far gone no reboot either. I have therefore not tried the loosely fitting battery workaround yet and hope the problem has solved itself however that might be idle hope.
@Susi_Schmid glad to hear your problem seems solved with the workaround.
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Facing the same problem. Got my new slim case yesterday, as my “regular” case was broken. Yesterday the phone rebooted 5 times, after opening random apps (phone, WhatsApp, Instagram). Today it only happend once. This never happend before. The case fits well and it was easy to put on, so I don’t think that I’ve damaged something when changing cases.
Besides the rebooting issue I’m very happy with new slim case. It makes the phone less “bulcky” and is nicer to hold now.
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Meanwhile, I also have a white slim case. I ordered it at a German retailer together with a new battery.
When I put the white one on for the first time this morning, the phone instantly rebooted again. This time, I realized that the power button of the case was stuck and kept pressing the power button of the device. The volume buttons also were hard to press. I put the upper part of the case off and on for several times until all buttons worked properly. Now the phone seems stable and hasn’t rebooted or shown any of the other problems.
By the way, the upper part of the white case with black buttons looks fabulous in combination with the turquoise back. So does the white back with the upper part of the turquoise case with the blue buttons.
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Same problem here with the FP2 and new slim case!
Seems this is a new problem, is there a workaround?
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I have the same problem with my koral red slim case. I try to put the case several times on and off. This works only for a short time. After some minutes the home button is blocked again and my fairphone restarts repeatedly till i remove the slimcase.
I am also experiencing reboot issues with the new slim cover. When pressing the power button I regularly manage to jam it and it does not release. The continuously pressed power button then causes the phone to reboot. Swapping the power button with the camera button (which I rarely/never use) resolves this issue for me.
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Do you mean physically swapping the buttons in the case’s rim or re-programming the phone buttons?
More and more folks in our Facebook group are reporting the jammed power button issue with the new slim cases and I’m wondering if anyone has found a method to avoid these jams.
I have a slim case since one week and I don’t experience the reboots. All Buttons are functioning perfect.
I only have one problem: the white case is getting dirty immediately. That’s not ok.
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I have also swapped the buttons physically. The buttons did not jam again so far.
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I followed this piece of advice and, as crazy as it might sound, the very long reboots and drop in battery are now gone. Only downside is that the camera button is almost unusable.
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Same here. Two fairphones with new covers.
One calmed down after a few days and is quite stable since than. The other Phone was not usable with two SIMs and is a bit more stable with one (a reboot every few days). Had to try the paper battery thing
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I received my coral red slim cover today and it looks absolutely fantastic!
Unfortunately I also have the issue that the power button gets stuck every now and then.
Subsequently the phone reboots if I can’t get it lose again fast enough.
Will try to swap camera and power button now.
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Perhaps Fairphone should look into stocking extra (camera) buttons, maybe even include a spare one in each set. Shouldn’t be such a logistical and ecological nightmare and extra costs are probably near zilch.
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Swapping buttons works for me, too!
I can use both buttons now without them getting stuck.
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The issue that the new cover may cause reboots, and/or that the buttons get stuck is new for us. We’d be very interested to investigate this issue further and want to to receive 4 or 5 covers back so we can have a closer look.
It would be highly appreciated if people who are experiencing this, could contact me, so we can arrange a cover swap.
(@Zorugal, @HolgerJeromin, @mgalactus, @brightlightbike, @Kerhac, @Palle, @Susi_Schmid, @KatYes)
Thank you!
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Without reading the whole thread:
While I was designing my own cover I also ran into these reboots - in probably all the cases it was the on/off button that had a fit far from perfect. Sometimes I wasn’t able to hear it click or feel a pressure point of the button but it was still rebooting - so I’m not entirely sure if it was only the button but I guess so.
Once it happened even more or less randomly: if I didn’t touch the phone it operated normally but as soon as I took it in my hand it rebooted. I guess the on/off button was pressed all the time - enough to overcome the pressure point but not enough to have the signal triggered.
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