Stevia round 2 started in PT (3 seeds) -- Various sprouts (not only stevia) have fizzled/dried out?? before taking off

I don't remember this happening in past years, so I wonder if it could have something to do with my mix?   Or maybe I'm not watering carefully enough.  But this year I've lost several PT-sprouted seeds after transplanting, where they make an appearance but then dried up / die before fully emerging.  But anyway, it hasn't been too bad, just a few here and there.