The tech came out today to fine tune the stove as the low hopper icon stayed on constantly. Since he left, the stove has shut down 4 times (gone into auto-clean mode) within 7 hours . IS THIS NORMAL? I realize it needs to go into shut down mode to dump the ash, but 4 times in 7 hours seems excessive to me. Anyone have this problem? By the way, the low hopper icon came back on and won"t go off. Go figure.