Co2 gone... again...

really just a rant right now... second time now my Co2 tank is empty.... 2 kegs in the kegerator, I changed all the o rings after the first time, cleaned everything like crazy...etc etc... when I put the new gas on I was checking every day to be sure things were alright, no issues... was gone most of the weekend so I didnt tough the kegerator tried to pull a pint tonight and nothing... checked the insiide and empty! another 5 lb tank to fill..and apparently still a leak to find still as well

Could it be the regulator leaking?

Did u soap test everything? Remember to froth it up and use the foam u will find the leak no matter how small