Cutter not connecting with lightburn , from new version update

morning can any one maybe assist. i have an atom stack A5 pro. i have been working with lightburn with out any problems. a new update was available on Wednesday that i downloaded. but since then my unit does not connect.

while busy with files when saving a message come up to say you are curently connected to the unit , but the unit is not even on.

Any suggestions or how can i get the previous version back

Have you selected the port the laser is plugged in to?

See the 2nd image on this page:
https://lightburnsoftware.github.io/NewDocs/ConnectingToTheLaser.html