Mine was doing the same thing...till I replaced the IMRC (approx. $120.00) that is located under the black plastic trim piece at the front of the engine. I had first popped the lid on the IMRC and cleaned/lubed the gearing. This worked for about a week until we hit 110F heat out here. Hope this helps!

Regards, Art

2004 Velocity Red RX-8 *Racing Beat Intake and Exhaust *Grand Touring Package *Red/Black Leather *Fender Strakes *Rotary Accents *Xenon HID's *Bose