Laser on whilst framing

Hello all,
I am using Lightburn with a Foxalien Reizer 20w laser and cannot get the laser to remain on when framing. I have found the setting in Lightburn to enable laser on framing but the laser never comes on.
I can switch the laser on low power but it goes off as soon as the head starts to move.
Has anyone else had this issue and been able to fix it?
Regards Mick