Same here. Wish I had a cat to blame.
Over the last week I lost 50 tomato seedlings to damping off. They were two inches high when they collapsed. Usually, that's a self inflicted mortal wound.
Not quite sure what I did. I've seeded the media in the identical fashion for the last five years. Maybe the trays and cells were not clean enough.
So, I'll clean everything with a bleach solution and try again. Oddly, none of the pepper varieties were affected.
Fortunately for me, there's plenty of time left.
It's a PITA, but I bleach everything every year. Hot soak, 10% bleach/warm water soak, lukewarm soak. Never a problem.
I hate that you lost that many seedlings. If you ever figure out why the peppers were immune, please let us know. Best wishes on re-starting your seeds :)