Logitech G25 Help - Motor Stepping in Left-hand Turn

Hi All

I'm new to sim racing and have on loan a Logitech G25 from a friend.

I've attempted to calibrate the wheel several times using two different machines, Win 8.1 & Win 10, only to find the wheel has an problem where the motor begins stepping in a left-hand turn as soon as power is turned on.

The problem can be seen here:
Recorded G25 Issue

So far my search hasn't returned a fix for this.
Any help will be appreciated.

Cheers