Does anyone have an idea of the cause of this issue with my 2007 SRX: It started a few weeks ago ( 84,000 miles), intermittently when braking, I feel a "shudder" through the transmission and the shift lever vibrates forward and back. It doesn't do it all the time. It is a 3.6 V-6, AWD. Could this be an issue with the electronics, or just needs a trans fluid change? Any help will be greatly appreciated.