All the hand held pointers suffer from the same problem......poor battery connection. Because the battery is not snapped into place or has a proper connecter for a 9 volt battery, you are relying on pressure on the pointer's copper battery tabs for a good connection. Every time you jab the pointer in the hole or knock it against the side of the hole, plus the vibration of the pointer itself you are changing the tension of the connection causing erratic pointer behavior. I have found this out with my pointer, I am going to get a hard wired 9 volt connecter and solder 2 wires onto the pointer tabs, I might have to modify the pointer a little but it is better then how it carry's on at the moment. Every time I change battery's it is like playing Russian roulette whether it will function correctly or not.
I just changed battery in my Vulcan and now it is acting goofy (new duracell) I am sick of mucking around with ****** rigging it with paper trying to make it work right.