Laser not stopping

I have had a JTech laser for quite a while and everything has been working perfectly. I just installed Lightburn on a new computer and have had nothing but problems.

When running laser etching jobs, it doesnt end. Im not sure if it starts over or just keeps repeating a block of commands over and over, but it repeatedly fails to complete the job properly.

The etchings come out fine and proper, but i have to stop the machine, which locks up the interface so i have to cycle the power to recover.

Anyone have similar difficulties?