I find a few tough pulls or waiting a while for it to snap back...
I've had this issue for 2 years or about. not yet found or checked for a solution, Is your issue intermittent like mine or all the time?
If all the time it might need new "firing-Pins" or what ever it uses
mine did this and then when i took the belt out to see what was wrong it rolled up and wouldn't come back out..... so in the end i just got one of the internet and fitted it now works perfect