Question on Automatic Transmission Fluid Change

Hi, I have recently bought a mini r53 2006 and performed atf fluid change and also changing the atf filter. My car now occasionally shifts to 5th gear when I'm at standstill e.g traffic lights / at junctions. It would take a few seconds or sometimes I would need to shift to P and back to D then only it will shift back to 1st gear. So far over the span of 3 weeks, this has happened twice. No check light or error code has appeared and I have double checked the fluid level as per your guide. I'm currently on motul atf-1a as it meets the stock atf specs.

Do you reckon I have a bad gearbox valve body? Or you have any other suggestions to my problem. Thank you

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[Nick at Pelican Parts]

Is it in 5th or limp? How are you determining it is in 5th gear?

- Nick

[Melvinn]

Hi nick, thank you for your reply.

I figured it By switching from D to m/s mode when it occurred. As I tried to manually downshift/up shift it didn't work and it stayed at 5th gear till I shift it to P and back to D a couple of times (between 5-10sec) then it went back to 1st gear.

I tried replicating this issue but it doesn't come often. So far only twice in 3 weeks. First time happened when I was in D. 2nd time happened yesterday when I was in M/S mode, I shifted from m2 to m1 as I approach a Junction. And it got stacked at 5th gear when I wanted to exit the junction..

[Melvinn]

Here's a video link to the problem I'm facing. Occurred again today when I was in D mode.