Same thing happens with ours... can't remember the brand/model but it wasn't cheap. It's secure as can possibly be... but she just flops her head forward and to the side and damn near chokes herself out on the shoulder strap when she sleeps. The car seat even has an adjustable angle to keep this from happening... to no avail.

Have you tried leaning the seats back a little via the recliner? I actually forgot about that feature until just now... gonna go try it out. BRB.

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