The internet connection is occasionally lost

General Discussion
1

On March 7, I updated my Fairphone 4 from iodé 6.12 to 6.13. Since then, I’ve had the problem of losing my internet connection several times (see the pictures).
Since the update to iodé 6.13, this has happened five times now. Only restarting the device fixes the problem. After a restart, it works for a few hours or days until the problem comes back.

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When I turn off Wi-Fi and enable Airplane Mode for a few minutes, the connection to my service provider is found, but LTE, 5G, etc. are missing (see picture below).

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Is this a common problem, or is it specific to Fairphone?
Are there ways to investigate the cause further?

Thank you in advance for your support.

2

In your first picture with the ! on wifi, it isn’t easy to tell if mobile data is working since wifi is prioritized.

To stay to wifi, are you using a randomized MAC? Maybe your wifi system doesn’t like it when this gets re-randomized. Regardless, I would look a bit more at your wifi system configuration and management to see if you can identify anything strange there.

To mobile data connection, after coming out of Airplane mode it will take a bit to re-register with the carrier.

3

Yes, I use randomized MAC.
I use a firewall (ipfire) on my network; this might be the reason. I’ll keep an eye on the issue and report back.