Can't hang off the phone after a call /black screen

Everything is in the subject.
I can’t go back to the screen after a phone call - need to take the battery out to hang off.
Any idea ??
The buttons (either top left or any of them) don’t function anymore.
Thanks for help
Fairphone 2 0S 19.08.1

Perhaps it is an idea to calibrate your proximity sensor.
Go to Settings,
Go to Maintenance
Go to Proximity sensor and follow the instructions


No need for that … just keep the power button pressed for about 15 seconds to force a reboot.

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