So I have a 6" tube smoker I fill with pellets. First two times I used it it was great. Second two times there have been problems. I put a torch to get them lit but I am finding that now the pellets only burn for 30-60 seconds at best and then go out on their own. I apply minutes and minutes of torch flame and the same result. I get frustrated and eventually give up after about ten minutes of applying flame and get it in the smoker. A little smoke comes out but not like the first two times. Currently using B&B pellets. Any thoughts?