2015 Volvo XC60

Since buying our xc60 Feb 2022, anytime we have our grandchildren we buckle their high back car seats in the rear seat of our volvo. Every time we install the car seats, the seat belts will not lock after being buckled. The implications of a seat belt failing to lock a car seat down could he catastrophic. It doesn't matter how many times we expand the belt and release it, tap the brake, buckle or unbuckle the belts will not lock. This poses a life threatening danger to children who are supposed to be safely secured in their seats. Coincidentally, the driver belt randomly locks sometimes even choking me if I lean forward quickly to get a better view. This happens without any sudden braking or change of speed. I have not visited a service center regarding the issue yet, I plan to address the issue at the upcoming vehicle maintenance and service appointment. Parents or caregivers need to be aware of this possibly dangerous failure. I check the belt tightness for our grandchildren car seats every time we stop. Until there is a resolution in place, I will attempt to find something that will keep the belt locked for a temporary solution. Please investigate for more possible complaints and issue a warning regarding this issue.