It has always been my impression that Rotax-owers.com is not Rotax the company, but only Rotax authorized. In other words, I think they are a couple of guys trying to make a few bucks on the side by s ...
I was having the same trouble on my Eurofox when it was just 6 months old. One of the connections had already started to corrode. A little sandpaper and it has worked fine ever since then.
Wes