Have you got a flashing orange light on the dash when it does it? Could be an ABS fault, it can override the throttle if it thinks the car is in a skid.
Try disabling DSTC in the menu (or on button) to see if it makes any difference?
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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