general problems of the 2004 Infiniti G35

The driver's-side shoulder harness portion of the seatbelt intermittently locks in position, making it impossible to reach the dashboard, unless the driver unbuckles their seatbelt first. I brought this to the attention of the dealer, orlando infinity, and they said the seatbelt was okay. I have hardcopy of their statements. Twice I have nearly crashed, secondary to not being able to reach the dash during all too typical orlando driving conditions. I question if this intermittent problem is inherent in other G35 coupes (2004). Please note, the incidents of the seatbelt freezing in a locked position are intermittent, such that the date below reflects when I purchased the car.