Is the needle seated into the tip properly?
Take off the handle, loosen the needle chuck, and push the needle forward until it makes firm contact with the tip and re-tighten the needle chuck.
Don't push too hard on the needle though as you don't want to damage the tip.
Mike
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon