As others have mentioned, it is most likely the regulator/fuel line assembly. A buddy of mine won a new Jiffy Pro4 propane auger at a fisheree the first year they were out. He had 3 or 4 regulators replaced under warranty. The last one, he finally had enough and sold the auger to buy a 2-cycle gas model. I wouldn't touch a propane auger with a 10 foot pole.
I have a Strikemaster Solo with a 6" and 8" drill...bought it new in 2009, have drilled thousands of holes with it and only had to replace the fuel lines twice. Carbs have never been touched. Run premium fuel with no ethanol and good 2-cycle oil or TruFuel (premixed fuel with a very long shelf life) and they will last forever. I drain my auger's tank at the end of the ice season, take the spark plug out and give the cylinder a shot of fogging oil, pull it a few times to spread the oil on the cylinder walls and put it away. Every year I add fresh fuel, prime it and it starts in 3-4 pulls. I also add a small splash (a cap full or two) of SeaFoam or B12 Chemtool to each tank of gas in my auger. It is a crying shame Strikemaster no longer has the Solo option in their lineup. I will never own a battery powered auger. They are slow and I drill too many holes in a day. I would need 3 or 4 batteries...at $150 each, that is cost-prohibitive for me.