End of the Laser Beam wiggles. PLEASE HELP

The machine will work all mechanical connection lose over time. You need to setup a maintenance schedule to clean/check you machine.
I do it about every two weeks, unless I see some kind of anomaly.
Take hold of it, power off, and move it around to see where it’s lose…
Not all of these heads are built alike, so you will have to figure out what part is lose.
The lens can be lose inside the tube also… this goes for any mirror also.
If you have more difficulties, explain what you are doing and what the expected and real results are…
Good luck