Sometimes furnaces don't smelt wood

Sometimes when putting wood in a furnace to make charcoal, the furnace will not smelt it. Changing the stack of coal/charcoal or wood to use does not change the problem. Oddly enough, other furnaces nearby will still be functional and only certain ones will not smelt. The only solution is to break the furnace and replace it in the same location to get it to work correctly. This is an odd problem.