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That usually would indicate a problem with calcium buildup inside the water heater. Try draining it and flushing all the debris out and see if this improves. Let me know. Thanks!
Take the drain plug out onn the lower left hand side and run some fresh water through there. Use a probe of some kind to get the chunks out (if any) and when it runs clean, put the plug back in. Be sure and turn it off first and let water cool off.
Are you using LP or electric mode here?
Have you had the LP pressure adjusted on the tank regulator lately? If the pressure is too low the burner won't heat the water up properly.
That has to be done with a manometer. Most RV shops would have one, but over there it may be a gas company. You can take it off and into them. Or a new one shouldn't be that expensive.
Since I didn't hear back from you I am wondering if you were able to resolve this issue or do you still need some additional input from me here?