@luksus I have only wipe userdata with TWRP, the wipe option from the installer does not work for me.

Work only if I wipe data from TWRP, but after this work fine!

@luksus I have the lastest stable build (OTA-16)
I have trying to install the rc build but rc have make a big crash, the device didn't not reboot!!!
I had to reinstall the Fairphone OS, after I had to downgrade to Android 9 and finally I have reinstall the lastest UBTouch stable build ... and the problem is the same ...

@luksus
I have an other very serious bug, when the wifi is not active, the cellular network don't work!
https://www.revocloud.ch/bugFP3/ubtouch_bug_cellularnetwork.mp4

@luksus
You can see the bug here : https://www.revocloud.ch/bugFP3/ubtouch_bug_wifi.m4v

@luksus, When the phone go to sleep, a password inputbox appears. If I enter the wifi password, the phone stay connected in sleep mode, but if I activate the phone and wait the next sleep, the same password inputbox appears.
If the wifi is lost, I must go to the wifi list and clic in the network name for activate the connexion.

I have installed OTouch this week-end and I have a problem with the wireless connection.
My access point have 2 frequency (2.4Ghz and 5Ghz) and when the phone go to standby, the wireless lost the connection.
When I disactivate one frequency (2.4Ghz or 5Ghz), the problem is solved!