Since you're in central MN, you know how cold it gets and that water expands in the cold. Not saying you absolutely have water under the siding but something is a cause of your glue bond failing. It could be a faulty mfg process. The pinch roller or vacuum bonding technology for RV filon exteriors is not mature through every Mfg.
Regardless, if it was mine, I'd be lining up the things I need to do to get some adhesive behind the filon and how I was going to clamp/brace everything to improve the situation. I've seen where some that repair these exteriors park them alongside a garage or building and use lumber to brace against the building walls. There are certain ways to inject the new adhesive and this company seems well regarded:
US Composites
