are you getting any error codes on the display when this occurs?
what type of display panel does it have? is it premium? or normal display?
Premium displays have the 5 buttons across the bottom and if you press and hold one of the buttons it will flash through the stored codes in the system and tell you the error history for the drive first and then the hydraulic. Drive codes will be 2 digit codes and hydraulic codes are 3 digit codes. (this is for premium hydraulic only though) if it has contactor controlled hydraulics then this does not apply.
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