I had the regulator with the gauge for a bit, it broke and the only thing available was the cheap inline flow restrictor, using that now. I took that off though to test and the CG water didn't lose pressure after running it for a bit at the bib.
I just talked to my neighbor about this, and he said he has the same issue. The CG I'm at runs at about 50psi apparently, so I guess this makes sense.
The last CG though this happened as well and that was running way higher pressure. Not sure what's going on.
This rig is a 2021 I just got about 6 months ago, so shouldn't be too much junk built up in the lines.
I just filled the fresh water tank and will run off that. Thanks for all the replies, I always learn things here.