P30i pulsating/hammering on my head

[koy23]

I was using the Dreamwear nasal mask, i keep waking up with rhythmic pulsating/knockings on my head that vibrates through my skull, i changed to the P30i and i felt immediate relief, then 2 weeks later the same happened again, yesterday i pushed the rubber part on top of my head towards the upper head valve air came out from the valve then i did not feel the pulsating but it was already wake up time.

Is this a common issue, does the valve get clogged so the machine keeps pulsating the air instead of pushing it through the silicone arms to my nasal piece?
do i need a maintenance method to stop this from repeating ?