Diana Bandit PCP Pistol .22 Cal

I've had really good experiences with all the Items I Buy from Diana Airguns, never had any issues with AGS, they are 5 star shopkeepers, but with Diana, I own the chaser and the storm rider and they are great shooters, but for some strange reason this one has been stubborn with filling and recently I have not been able to fix a pcp tube gasket leak with out it then leaking from the gauge gasket and then it would leak again from the tube top gasket.. have not been able to keep any air in it since this happened....I have had one gasket go on my storm rider rifle pcp tube and replaced it myself in 2 minutes and pumped it up and its all good still, this one...not sure what the deal is...maybe they were training a new guy at the Diana factory that day who knows..