It 's worth taking the stator plastic cover off after each trial.......I've done this with the Beta's I've had and every time ....cover comes off and water is present......not by the gallon, however more than enough ! Never had a hassle with the 06 nor 07
Might be the fix for you...
All this aside, it would be good for the factory to get to grips with this. After all, if the stator fails and you've just bought the bike, can it be said to be fit for purpose...?
Despite the stator being changed free of charge...!