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Possible that they has been an increase in the temperature of the tank? Since there is no way to get more CO2 into it without you knowing, the temperature increase is about the only way for the pressure to go up on the tank side.
Possible that the solenoid is not working right, sounds like possible but then what is on the end (diffuser, etc? ) may come into why the on again/off again.
 

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Okay, I understood the pressure had been running 800 and now gone to 1000, but one that has been filled and not been at a steady pressure is likely to vary some. Both with how much a little bit but also with a higher temp, the pressure does go up. These are not like gas gauge which shows how much liquid is left and changes as that liquid is used. A pressure gauge will only move due to temperature until all the liquid portion is gone and then begin to move down as the remaining liquid is not there to gas off to maintain pressure. Not used that diffuser but some have a certain amount of pressure needed to pass gas. They can seem to act somewhat like a stopper while pressure gradually builds in tubing and thenkind of reach a "breaking point" where they pass the gas built up in the tubing. Tubing can do what we sometimes call "balloon" and hold a bit more gas. Maybe something like the diffuser holods gas flowing so that the bubbles begin to move but then as it reaches a certain point the bubbles almost stop until finally the pressure builds and then seem to burst through.
Lots of guessing on that so see if that looks like anything you see!! Sometimes guesses are not very good when we can't actually watch things happen.
 
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