It looks like gearbox problem to me. If you speed up to and hold steady eg 70mph the engine revs will be below 2000 rpm I recon. Then if you suddenly lift your foot of accelerator - will the revs drop by more than 50 rpm?
My car also had air con software update done. Did anybody else have their air con fix done? I wonder where it came from as my car was in for major service in Feb and air con was fine at this point.
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