Yes, that's for sure, had initially searched the internet but couldn't find anything of information.
My girlfriend had it on the phone and when she asked why it had happened and why, the answer she got was that it was normal after 3.5 years in use, a ridiculous answer of course but yes, what can I do about it, am glad it was repaired.
Had already asked the supplier if the same model was still available, but no, out of production, the replacement model could not handle the amperage of solar cell panels which would have led me to switch it differently, which fortunately was not necessary now.