Vic, you have my sympathies. I faced this spectre myself a year or so ago. My solution, it seems, at least for now, was simply to leave it on full time to lubricate the seals. In your case, it does seem to be pressure related. Unfortunately, as we know, anything air con gets expensive which is why most people just let it go and do without. I would trawl through as many You Tube vids/internet threads and try and narrow down the potential source of the problem if possible. I am sure I saw a Scotty Kilmer air con video where the regulator was the problem. If it turns out to be a relatively easy/common sense fix then all well and good but I personally would not spend too much on it for obvious reasons. If you need air con, it makes more sense to sell the existing Jazz and buy a younger model, if possible. Not an ideal scenario I know, but the old adage of 'throwing good money after bad' springs to mind.