Success
Just a brief update to follow up.
Shortly after the messages popped up again I paid another visit to the dealer and informed them about the problem returned. This time they mentioned they did replace the back up battery.
Since then a few hundred km's have passed and... the message(s) are still absent!
I'm obviously not sure if this latest fix also implied the procedure as mentioned by Clan was actually done. Bottom line: it seems solved for now.
The phone did reset itself once however (I experience the language setting back to the SIM card (and car) default and the short-dial memory erased), but likely that is another issue.
For the record: since I had experienced this problem from the day of purchase, even though warrenty had expired, the fix was FoC.
W.
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