@Raph this link goes over all the gory details and how to fix it Rework Instructions for 11th Gen Mainboards to enable powering the RTC circuit from the main battery . Good news is they should have a fairly easy single solder point fix for it. Based on your description and the age of the machine I would say your RTC battery is getting ready to give up. I would at least look to replace it before your trip, and if you can get the rework done. You should be able to get a replacement battery through framework support.
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