Hi David
Does it happen at all faucets, sink1, sink2, shower, tub, hot water, cold water, etc.? How often does it happen? Under what circumstances? Trying to isolate the system involved.
For example, I've noticed that my water pressure is very low while I'm filling the fresh water tank from the city water connection (vs. the hose in the fill hole). Maybe there is some sort of ball-valve or flapper-valve that is sticking.
EdC