Invalid SIM whenever Wifi coverage is lost

For the last days, whenever I loose Wifi, I get “invalid SIM” error and have to reboot phone to recover mobile network. No new application or SIM/network operator change. Seems to have started after last firmware update. How could I troubleshoot further?

Thank you!

What happens if instead of rebooting you turn on flightmodus and then flightmodus off?

That used to work to solve old bluetooth issues, but not this time. Only reboot recovers SIM access.

No new occurrences since last upgrade, hope it was solved.

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