This seems like a failing 24 VDC power supply.
The power supplies seem to be rated for less than the actual current required by all the hardware in the machine, but most of them “work” due to their ability to handle slightly more current than their rating. Because they’re operating out of specification, any decrease in performance will push the weak ones into failure.
I assume the “150AF” in your machine description means it has an auto-focus pen and a button on the console to start the auto-focus routine. If that’s so, then the machine also has a honkin’ big stepper motor driving the leadscrews to raise and lower the platform, something like the one over on the left in my machine:
A simple test for the 24 VDC power supply: disconnect the power for that stepper motor to reduce the load on the supply, then see if the controller behaves properly.
My machine has two smaller stepper drivers for the X and Y axes, with a much larger one for the platform motor. This picture shows the X and Y drivers, with the larger platform driver over on the far right:
Each stepper driver has a connector for its power, labeled something like DC 18-50 V Input. It may be a separate two-pin connector, globbed onto the four-pin connector carrying the motor wires, or just part of a six-pin connector with all the wires.
With the power turned off, pull that connector out of the platform driver. Reconnect the home switches if you’ve disconnected them.
When you turn the machine on, it should home normally and behave properly, although it cannot auto-focus or move the platform. You can turn the laser power supply off (the machine likely has a key switch for that supply) and run all your usual jobs: the machine should go through all the XY motions, but won’t mark anything with the laser turned off.
If it now behaves properly, a new 24 VDC power supply with a higher current rating is needed.
Report back and we can kick around more debugging based on what happens.