We had similar problems with the first cartridge at the beginning: the transition from the bottle to the appliance was not tight, so a lot of "air" came out next to it and the cartridge was quickly empty. From the second cartridge onwards, however, the problem was gone - for whatever reason. Since then it has worked well.

Meine exploded. I took it back to Digitec. If its no under warranty, try contacting Stelton, they were friendly.