Hello, I have a smoke hollow electric smoker. The problem I am having is the chips are no longer maintaining a good smoke. They start, but then stop. Last weekend I did an 8 hr smoke and the chips were hardly burned up when complete. When I first used the smoker I was refilling the chip tray every 3-4 hrs. I also have noticed a reduction in smoke flavor in the meat. Any suggestions on what might be wrong? The smoker could use a good cleaning as there is alot of build up on the bottom. No vents in the bottom aside from where the grease trap hangs so I didn't think this would be the source of the problem. The electric element has no problem holding temperature.