Problems with 2010 Mazda Mazda5 CHILD SEAT

We have two sunshine kids radian xtsls manufactured in 09/10 and 10/10 (model # us19500) for our twins. they are installed rear-facing in our 2010 mazda5 with super latch. on various occasions i have noticed that the super latch has become loose. at first i thought it was due to an installation error on my part, but i would tighten the super latch and have a great install and have the same problem occur. i'd say it's happened with both seats at least 3 times. i think my children are somehow bumping the buckle or resting their feet on it while we are traveling and this is loosening the buckle. it should not be this easy to loosen! i notice because the seats become very loose and there is no way that the super latch was not tight as i now check it every time i put my kids in the radians. i'm contacting diono today about replacement super latches but am very disappointed after reading online about there being over 100 complaints to the nhtsa about this problem that diono has not been required to issue a recall for their super latch. if i would have known that this seems to be a common problem with these seats, i would not have chalked up my initial problems with the super latch to an error on my part. i wonder how many other parents out there are doing that right now. (related vehicle information: model year=2010, make=mazda5, model=mazda5). *tr