if you are having that luck with hermies you should look for a something causing them stress.

usually, light stress...

could be a light on a power strip or other device, an alarm sensor, under the door... visit your plants just after the lights go out. sit there for a couple minutes in the dark, and see if you don't find some light.

or, you just had some bad luck w/genetics. seems like allot of bad luck tho-