It sounds like it's hitting some threshold. I.e., if the gas can't go anywhere, the pressure will build up over time and once the pressure is the same as the output, it can't go anywhere (because it has to flow from an area of high pressure to an area of low pressure).
So, before you raise your pressure any higher, check to see if there's a blockage somewhere.
Are you using a check valve on your CO2 line? If so, it's not backwards or something is it? Can you blow through it yourself? If you can't, it's a sure bet that the CO2 can't either.
Check for crimps in the line maybe ... or clogs in your plumbing.
Try opening and closing the needle valve, all the way, a few times. If there's a blockage in your regulator that might help blow it out. Sometimes there might be some teflon chunks in there or maybe there's some residual crud in the cylinder itself.
I'm not sure what else to suggest. I've had issues of inconsistent bubble rates with those regulators, but nothing that couldn't be resolved by making minor adjustments. A full out "stoppage" means something is not right, IMO.
Good luck
__________________
-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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