[Everglide]

Hi

I'm not sure how to label this thread but hopefully I can describe the issue..

I've a 2011 X3, auto, diesel with 145k on the clock.

When driving the ride is like you're constantly driving over cats eyes. It happens at low speed, high speed, mild acceleration or heavy acceleration. The gearbox cuts drive. Imagine a manual car and you're driving along engaging / disengaging the clutch every second.

It's worse when towing.

When cold it's better for maybe a mile untill it's warmed up.

It became much worse (my wife noticed it) after a recent MOT. The rear tyres were changed. Different brand to the front but the same size. Pressures are all ok.

The gearbox oil has been changed in the past 2 years (not sure on transfer box). It has been checked and it's still full and clean.

The car shows no errors on a code reader.

When you stop after a drive the car shows on it's screen (something like): Drivetrain, possible to continue journey, have the problem looked at service. This happens even if you just start up and move the car on the drive.

I think that's all the useful information I can provide.

Where should I start on resolving the issue?

Many Thanks.