You are switching to Mint? What did you use before.. Tello?The script you mention checks to see if modem is in MBIM mode & if so, permanently puts the modem in RNDIS mode. So “in theory”, the script only affects your modem once.
Maybe check to see that you have 4G data left in your cellular plan. If I run out of 4G data, my provider falls back to 3G which no longer exists in USA so I end up with no connection at all. Perhaps you have same issue? That reminds me I need to switch to a provider that will throttle 4G rather than cut my connectivity totally . Mint mobile here I come….
Perhaps make a thread for this topic in the Reddit community. There are a few more European users there too.
If so how much is the cost difference between the two providers?