SMAX Belt Tensioner Issue

I also own an SMAX. My symptoms were similar, however on mine the serpentine belt squealed badly at startup, and then it eventually went away. Is it that as well?

Yes, initially there was also belt squeal, but that's gone now. It's just the handover that's not working. Was yours also the tensioner pulley?

Yes, it was exactly that! It's most likely a defective belt handover. I'd recommend taking it to the workshop. I had to replace the whole belt drive and tensioner.

Thanks a lot! Turns out it's exactly that - a defective belt tensioner. Repair will be around 455€. Will get it sorted.