I have a 2011 facelift SD4. I have had the car fir about 9 months and I love it.
I have done about 8000 miles in it since buying it. It now has just over 39000 miles.

Recently the car has started to 'stutter' ocasionally when changing gear. It doesn't change gear smoothly when this happens. It seems to be mainly from first to second gear but I think it also happens occasionally at higher speeds / gears but when under low engine load.

When it happens, the car makes a 'cha cha cha' noise. It sounds like it is coming from the grabox or central tunnel areas.
Where is the Haldex unit?
Could it be Haldex or gearbox?

Anyone experienced this in the past.

Thanks in advance for your help FL2 HSE Lux 2011 SD4 Gallway Green.
Fiesta 2014 Ttanium x 1.0 ecoboost - Fantastic 125 bhp 1.0l 3 cylinder turbo!
1976 Triumph Spitfire. Owned for 25 years Fully restored, magazine features - not quite standard
1985 Toyota MR2 MK1a. The oldest surviving example in the UK and one of only 5 left in 8B8 Blue

Haldex is at the rear, could need a gearbox software update?

Had this on my 07. just had cam belt, auto g/box and haldex oil and filters changed haldex filters were in a hell of a mess no funny noises now. go and change the haldex filters with new oil.
Bell engineering do a kit and received it the next day. Around £80

Great. Thanks Dave. So yours made the same Noise too? FL2 HSE Lux 2011 SD4 Gallway Green.
Fiesta 2014 Ttanium x 1.0 ecoboost - Fantastic 125 bhp 1.0l 3 cylinder turbo!
1976 Triumph Spitfire. Owned for 25 years Fully restored, magazine features - not quite standard
1985 Toyota MR2 MK1a. The oldest surviving example in the UK and one of only 5 left in 8B8 Blue

Yes sure did. Wish I had realised it sooner, I thought it was a bit loud