My convertible child restraint comes equipped with a latch strap with a stated limit of 80 lbs (superlatch). When I install the seat using the superlatch strap, I am repeatedly finding that within two days of normal use, the installation becomes significantly looser-sometimes as much as 2-3 inches of movement. As a child passenger safety technician, I am confident that the seat is installed correctly and tightly to begin with. I know that I am not the only person reporting this for this seat. I have also had the superlatch clip/hook mechanism come detached from my vehicle's latch anchor bars several times, despite hearing an audible click when installing the seat and pulling on the strap to ensure proper attachment at the time on installation. The superlatch strap adjuster is failing to maintain tightness and the connectors are not remaining securely attached to the latch bars, both of which are unacceptable. The manufacturer's "solution" is to install with the vehicle belt and/or replace the original superlatch strap with a standard 40-48 lb latch strap. (related vehicle information: Model year=2010, make=Nissan, model=Sentra).

- Snohomish, WA, USA