According to the friends' feedback recently, to solve the problem of the print head falling down after printing is completed of your Q5, please go to download the latest frimware.
①The nozzle is too far away from the hot bed. Please check if the nozzle is too close or too far away from the hot bed
②Select the Brim option under Build Plate Adhesion when attaching object to platform in slicer ,increasing the value of the brim width according to your needs. Set hot bed temperature to 65°. Necessary temperature will vary with type of filament used.
Remove the leveling sensor, then adjust Z0,install the filament, then preheat the nozzle to 210 ° C,preheat the hot bed to 60 ° C, feed filament and start printing.
Click once to move the nozzle 0.1, Z+ nozzle moves up, Z-head moves downwards, the software automatically saves the value after clicking, and the value is saved until it is leveled again.