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I have the same problem as @Gilles68 a while ago. I though it was my phone's proximity sensor that was broken, but reading this post I realize that maybe it is some issue with the BQ 4.5.
I mean, maybe all BQ 4.5's proximity sensor have a short life, a kind of planned obsolescence.
A similar issue happens with the screen. I bet that @x-Dub had to replace the screen because the digitizer did not respond in a wide horizontal line crossing the center of the screen. Mine has the same issue, but I have not yet change it. When I have to call someone with a 5 in his/her telephone number, I have to switch to windowed mode and move the phone app, so the number 5 stays in the top or bottom of the screen . -
@aimar : Yes, that's why I had to replace the display. I'm quite sorry, the phone looked better without the bottom painted buttons.
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small follow-up of the problem:
Concerning the loss of level of the battery that was draining in ~ 6 hours if the WIFI was activated, everything is stopped after the OTA-19 update !!
I have again a correct discharge of ~10% in 6 hours!!