I have read some of the posts about issues people are having with their radians- should I be really worried about mine? I have 2 xtsl's that have been installed RF w/latch for about 4 months now. I tug on them all the time and they are always rock solid but I'm really nervous about them being loose now. Is it old radians that are having problems or newer? Should I re-install with seat belts just in case?