Problems engaging 1st Gear
 

I have an Audi TTS 09 plate. I sometimes find it impossible to engage 1st gear.
The other gears all work, but I feel as if they are not all in the right place and have shifted slightly??
This all usually happens when the car is warm.
Otherwise the movement of the gear stick is fluid and positive.
The garage have checked it superficially and added oil etc.

Any ideas?https://cimg3.ibsrv.net/gimg/www.aud...1f1844c05e.jpg