Hi, I have a problem with my 52 plate 2.2 vectra automatic. On occasion when on a long run or if the engine is hot it defaults to 5th gear nothing so far has been recorded as a fault in the diagnostics. It seems to happen when you come on and off the accelerator when the engine is hot, sometimes the gear change can be lumpy or harsh, but 95% of the time it runs really smooth and is a pleasure to drive. Can anyone help, or have any ideas as to what’s wrong Cheers