In my experience, about half of rotax twin stators are going by 50K miles. Germany is well aware of the problem, but there is no simple fix. The factory unit is a good one, my personal opinion, this is a lubrication problem. The stator is not getting the oil bath it needs to run within temperature tolerances.
Theres nothing I am aware of that an operator can do will reduce the chances of this happening.
A heavier rewind or exotic insulation would help, but finding someone qualified to do that will be a trick and a half.
Sorry I don't have better answers.
Owned to date. Honda Aero 50, Honda Elite 80, Honda Elite 250x2, Suzuki Katana, Suzuki RF600, Yamaha YZF1000R, Kymco Xciting 500, Suzuki GS500, Suzuki Burgman 650, BMW F800GSx2, BMW S1000RR, Aprilia Scarabeo 200, Aprilia Caponord, Aprilia Sportcity 250
I love and miss you Jeneca and I'm sorry.