Heard this exact thing happen to my buddy Dave with a TV mount in his basement. He used the same plastic anchors and the whole thing came down during a movie night, barely missed his soundbar. I mean, the drywall looked fine until the weight hit it, then it just gave up completely. Toggle bolts are a pain to install but they're the only thing I trust now, even for light stuff.

Man, I feel your pain on this one. I caught my presetter reading almost a grand off on the X axis after a crash I thought was minor. Cost me a good chunk of change on a titanium job before I realized it. Now I run a quick check with a known bar every Monday morning before any real work starts. It only takes five minutes but it's saved my ass more than once since.

Thermos coffee on public transit sounds like finding a secret club.