I had a strange problem where the kitchen faucet would 'pulse' and slowly decrease volume until it was just a trickle. If I then turned on the bathroom faucet, the kitchen faucet flow would increase to normal. Scratched my head on that one, did all the stuff recommended here to no avail. No scale anywhere. Someone here asked how my pressure reducer was? So tried a different one and that improved the situation at this park where we have 115 PSI. But didn't totally fix it, just improved flow.
Finally bought a
flow regulator from Amazon...something I've always planned on doing anyway. Connected it to the shore water faucet, set it for 50 PSI, and darned if it didn't totally fix the water flow problem. Home Depot has a brand of flow regulators that's highly regarded too.
Not sure those brass pressure reducers really do that great of a job when there's high RV park water pressure.
So wouldn't hurt to check your system, especially at the RVs shore water inlet in your water compartment, for any pressure reducers the PO's may have installed. I know the one that came with my RV when I bought it gave me many weeks of water flow problems that changed as I moved from park to park before I noticed it and removed it. Wish I'd gotten a better pressure reducer to replace it then instead of another regular brass one. Had another 20 odd months of weirdness with the water.
Pretty happy with how it's working now.