05 Limited Roadster,,94K ,,sometimes the shift lever (slap stick?) will not down or up shift the transmission. It seems like the electronic shifting is not making connections. I usually get a check engine light . Dealer has seen the car several times and cannot find a problem. Once they thougtht it was the Winter/Summer switch or something like that. I do not know the code they are getting. Anyone had these types of problems? I tried to search but could not seem to find transmission electrinics. TIA