I had the same problem, after $110 the F&P man could not fix this. Said it was not level...still the same problem.
I found that the Struts that support the bowl were worn at the top, The thus the shock absorbing feature did not work. Repaired the struts greased the rods with silicon grease, (Stops the wear on the nylon) all is well. Unit now 12 years old. Can provide additional details if required.
bags@iinet.net.au
Mark
July 2007