rad_uk

Please help, Guys I have a 06 plate galaxy tdi auto , the problem is as soon as I start driving she starts fine but when changing gears she sometimes changes up with an instant loss of power and goes into limp mode., if I quickly turn off the ignition and straight back on she will go back to normal running , sometimes she will run fine all day and other times it happens every 5 mins , Any ideas where to start ?