I have a Martin Venturi F3 stove. Bottom fed via auger. Starting last year it would clog up in about 2 weeks versus the month in half run time it used to give me. It clogs about 3 inches in and that's it. Is is possible I need a new auger, or could I have another issue? No changes in pellets the last 4 years, no changes in the amount of fines...it just starting clogging up. Any help would be greatly appreciated.