I have heard of an instance where the round piece of tank wall that was cut out for the valve with a circle saw got left in the tank. It would get washed into the valve, back up undissolved paper, and stop the flow. It was found by looking in the tank with a boroscope.
“Flushable” wipes aren’t for in a holding tank system.
2 meter wipes (using 2 m or 6 ft of azz wipe) per set is asking for trouble.
If the valve is manual you should feel the difference to how the gray valve operates if it is broken. If it feels like both valve slides are opening the same I would see if someone would look in the tank with a scope.