We currently heat our house with a Mt Vernon AE--free standing stove, installed new 12/08. I had no issues with stove last year (with the exception of a cracked baffle plate which has since been replaced). Last year we burned 4 tons of Barefoots with no issues what so ever. So far this season I have used about 1.5 tons of Lingnetics. Approximately 2 weeks ago I noticed the stove periodically would not restart after shutting down for an auto cleaning or just because it got up to set temp. Of course I was either asleep or came home to a cold house it never seemed to happen when I was around. When this happened thermostat would read "MIN FIRE POT TEMP" and it would give me a RETRY option on the thermostat which I pushed and within a few minuted it would restart. This situation seems to have become routine now almost everytime the stove shuts off it will not restart on its own. But again after i hit retry button stove comes right on. I first thought there may be an issue with fines somehow clogging auger or drop tube area, but I think this is dispelled due to the fact that the stove always starts right up after I hit retry. I also thought igniter may be going bad but this does not seem to be true either if it fires back up after hitting retry. This has happened with a full hopper, a nearly empty hopper, and everywhere in between. I even have tried using some of the Barefoots I had left over from last year thinking the Lings may be the culprit, that has not helped. I routinely (2x's week) vaccum firebox, clean fire pot, glass, etc. and bi-weekly I clean baffle, drop tube, hopper/auger area, heat exchanger, and 2 exhaust exits thoroughly. I feel stove has performed well until this issue and heats approx 2800 sq. ft. quite nicely. I have described the issue the best I could with the remedies I have attempted. Any suggestions to help in resolving the issue before I contact the quad tech. would be appreciated.