I have purchased a Job Max just after Christmas and had to return it 2 weeks later because it would only work if I twisted on the battery. If I let go it would stop. Home Depot replaced it with another that is now in the shop for the same problem. They said they do not yet know what the problem is and also have 3 others to be repaired. I love the tool, but it would be nice to find out the problem so it can be fixed and I can use it again. Does anyone here know what this problem could be?