Ducati Voltage Regulator

Regulator failures aren't usually the regulator's fault. Sure there is a bad one now and then. Rotax isn't the only one that uses these and evidently all the others aren't failing. Poor location with exposure to too much heat, too little voltage draw or too much voltage draw causes excessive internal heat. Bad wiring setups cause issues too.

If you are having constant issues I wouldn't think it's the regulators fault especially if it is in the same model plane.
Try ruling out heat first. Use some heat temp indicator strips on the side of the regulator. Mine has never been over 140F. Location is everything. Vans had issues on the RV12 with their location and heat. Now they have approved in in cockpit location. Add up all your voltage using equipment and see if you are too close or over peak output. I work on many 912's every year and none of them have regulator issues, but the system was well planned out.