Citroen C4 Gearbox Slipping

That sounds like a potential issue with the transfer case, yes. I had similar symptoms on my old Volvo, though it was a petrol model. How's the transfer fluid been maintained? Any gear grinding noises?

Transfer fluid? To be honest, I haven't touched it. I didn't even know electric cars had transfer cases needing oil changes. Gear grinding? Hmm, now that you mention it, sometimes...

Ah, that could well be the culprit. While electric cars have fewer moving parts, many still use a transfer case to manage power distribution. Neglecting the transfer case oil can lead to premature wear. Given the symptoms and mileage, defective gears are a real possibility. I'd advise getting it checked at a workshop ASAP.

Thanks a lot! You were spot on. Took it to a workshop, and they confirmed it: transfer case oil wear. Defective gears. Repair cost: 330€. Appreciate the help!