I also have an '09 Stella, but have not had any problems like that because it does not rain in my state, at least not in the part of it where I live. Ask on stellaspeed.com. Something somewhere is grounding out when it gets wet.
2002 Vulcan 750, 2001 XT225
2008 Vino 125, 2009 Genuine Stella
2012 Zuma 125, 1980 Puch Newport moped