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ok now I could believe that the problem is inside your ECU. It might have been programmed that with fifith the RPM`s should be something at certain speed. If you have too much variation it might protect itself and change to neutral :/.
What gear ratio did you put in and what is the percentage difference between the two gears?
Lupo 3L gears are:
1st 3,455
2nd 1,955
3rd 1,182
4th 0,813
5th 0,642 and If I remember correctly that is freewheeling
So your new fifth is probably too close to fourth etc :/.
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