there are many reasons an order picker might go into full traction shut down, as a safety measure. low battery _should_ make the lift cut out before the traction shuts down. full traction shut down is more likely to be from some (safety) thing where the alternative would have been an uncontrolled operation (run away full speed with out control*, or not being able to steer).
on trucks using an SCR controller, low battery voltage CAN cause a situation of run away (the main SCR turns on and does not turn off, technically speaking,) which would correctly trigger a full safety shut down that would require the key switch (or maybe disconnect the battery, in some cases) to get the machine to reset/reboot.
I would call it a "known safety feature", not a "known problem". good luck.