Rockshox Zeb Ultimate Clunking

Hi everyone.

I have a Rockshox Zeb ultimate that makes a distinct clunk under high speed compression.

It also is making a hissing noise under rebound.

Its especially noticeable under climbing and the fork feels unsupported for the first few mm of travel.

I tightened the headset and axle to make sure those weren’t the culprits.

Any ideas?