I did some tests and I think it’s more likely a WaveUp, than a Fairphone OS problem:
https://forum.fairphone.com/t/use-of-proximity-sensor-drains-the-battery (scroll down to my post from today)
https://gitlab.com/juanitobananas/wave-up/issues/79
Here, i don’t use waveup… I’m using the proximity sensor with different apps…waveup is not on my phone
I unmounted the SD card, removed a few old podcasts, cleaned the dalvic cache, and this morning the battery level was the same as ist was the night before (I turn wifi off and leave it in airplane mode o.n.). I have not the Waveup app, but Gravity Screen which worked fine all this time. So, it seems the big SD card could have been the problem in my case. Thanks for your tips!
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Keep an eye on Gravity Screen too. Does it make use of the proximity sensor for waking up your phone or for switching off the display?
The proximity sensor is an option, but I have it partially disabled so that the waking up of the phone relies on the gravity sensor. It is working fine so far.
But you are right, wenn the proximity sensor is on (even partialy), the battery drains rapidly. This is new since 16.08, it was working fine before update.