Three things about the care and feeding of these sort of lighters:
1) Make sure that you are using the correct adaptor.
2) Fill at a 45 degree angle or vertically with the can uppermost.
3) Don't turn the lighter up too high. What your seeing is gas coming through the feed pipe from the reservoir under pressure. The higher the pressure, the longer it takes to shut down. So dial the regulator screw on the bottom down a touch. That should cure the problem.