The only reference to extended use in the
owner's manual is to use a spray lube on the exposed pistons to prevent rust and corrosion that could damage the seals.
There's
this thread on the Forest River forum that suggests that if the system is new there may be residual air in it. Since you have a 2021 rig, how often have you used the leveling system? It wouldn't hurt to cycle it monthly.
Here is a thread on the
Thor Forum from a guy with the same issues. He says he called Lippert and was told to check the fluid and add if it was low, and several folks on the thread said that fixed their problem.
I would start by checking and correcting the fluid level, also making sure no fittings are weeping, etc. You can also call Lippert directly at 574-537-8900 if you want to ask them yourself.