Help alarm 8 and alarm 3

I am having troubles with alarms and my machine just not working right . I have a creality falcon 40 watt

These alarms are not related, for the most part

Alarm 8 is usually an error of homing, when the belts or something physical is not correct and the machine is unable to debounce/pull off your switches.
Having a Creality myself, make sure your belt tensions are correct - which does not come in the manual.

Alarm 3 is more based on a crash of the controller or interference on the USB connection. Are you using the stock cable?

Hi, had same issue few weeks back. After a few frustrating attempts to solve it, I uninstalled the laser, then reinstalled it in lightburn and all is ok again.

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thank you i have done that and still the same issue