So when Pressure side is on 18-20 psi

vacuum is 6-7 in hg

ran for about 5 minutes before the noise and filter pressure dumps to about 10. basket vacuum drops to 1 or zero..

Another thing I notced this stops after I reseat the lid.... without waitig for a cool down... I replaced the oring but do the lids go bad? I cant see anything... I slathered the o ring really good with lube and got about 20 minutes of vacuuming before the noise started again. If there are air bubbles they are crazy small...

To vacuum just as I have done for 4 years:
Kill the two skimmers, turn cleaner valve on, to get the vacuum moving

While vacuuming the pressure stayed around 18 at the filter... vacuum climbed to 15 in hg at the basket. as a result of the skimmers off.

Then when the noise kicks in everything dives...

Lid Assembly? Any votes?