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A newbie here and first post please be kind lol

My 2000 golf tdi is having problems with the auto gearbox.
It is very tempermental at going into reverse, it clicks in position ok, but it doesn't want to reverse, it must be doing this at roughly 3 out of 10 times to give you a idea.

Anyone had this problem or may know of it.Will i need a new gearbox??

The car has done 171,000 miles fsh if it helps.

regards