2010 VOLVO XC70 Seat Belts Problems

On two P3 Volvo cars I have owned now, the front passenger and driver side seatbelt release button sometimes does not release the seatbelt, this happens almost daily and requires the button to be forcibly pressed to release, more commonly on the passenger side. Additionally, on two separate occasions, the passenger side seatbelt has slotted into the latch but was loose when tugged on, not being able to support any tension. This happened on both cars that I owned and with different passengers, where we would arrive at our destination and then they would go to press the button and the seatbelt simply disconnected. On my newer P3 car, (With the VIN here) I replaced the seatbelt catch device on the passenger side believing this was an issue with just the car, but the new replacement also had this issue. This is a serious safety issue as it prevents passengers...