It seems as I run into a common issue with my Raspberry 4. After an indeterministic uptime, the wifi stops working.

And here is the hotfix, a small script provided by @pitto first restarting the nic and if anything fails just reboots the device:

This bash script checks for wireless internet connection and, if it is failing, tries to fix it.

It is simple and it seems to work.

I just have to write some automation to roll it out automatically including a corresponding cron job once I find some time.

GitHub Repo: https://github.com/ltpitt/bash-network-repair-automation