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WiFi calling deregister after prolong device up time on version 31.1004.4040.92

Star III
Same issue as before

Star II
Yes, I also have this strange behaviour on my zenfone 8.
I'm in France with SFR as provider.
Sometimes it does not deregister for several days, Sometimes after few minutes in standby, when I reactivate the screen, the vowifi icon is not present.
Most of the time, it reapears within few seconds, Sometimes, I have to disable and re-enable vowifi.

My provider is not faulty as it never deregisters on my pixel 5.

This minor issue together with the late security patch es are my only minor complaintes on the zenfone 8.
Appart from this, this is perfectly running under Android 12,great performance, great battery life, good picture quality with gcam, perfect size and weight. All by all, really happy for the moment.
Hope it will Last and that no ramdump will occur on my phone 😉

Star III
Additional observations after deregister, the phone reverted to volte and the phone calls will constantly disconnect randomly. Only disabling volte can avoid the disconnect. I think something may have crashed inside the OS. Again a reboot will get the phone back to "normal".

Star III
Same issue with version .107

Star III
Same issue with version .43