2020 400 water not very hot

We have a 2-month-old 2020 400 BDL. It's already been to 7 states and lots of nights. We actually use the bathroom and shower. My issue is that the water doesn't get that hot. Warm? Yes. Hot? No. Here's what I've tried: turning the temp gauge outside to its limit, and boosting the water heater and waiting 30 minutes. There is MAYBE 2 seconds of fairly hot water then it becomes fairly warm. That's it. Any suggestions? Thanks.
2020 T@b 400 Boondock
TV: 2013 Lexus GX 460

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