Looks like bacterial spots.

Water-soaked lesions that dry out and turn brown forming on the underside of the leave: raised brown cankers on stems: cracked brown lesions

It doesn't look like leaf minors...

Are they older leaves? Are they still indoors? If still indoors how's the lighting situation?

The spot doesn't appear until the day it dies - leaf is fine/yellowish, (all my lower big ones have been yellowing and falling off no spots) and then you walk by and it's completely hanging by a thread/dropped and looks like that It like looks like a burn Or like something the root hit something it didn't like like the Epsom ?

And Someone mentioned water soaked liesions? I bottom feed so the leaves are never wet

My guess is that that was a lower leaf on the plant. If so, throw it out and don't sweat it. Totally normal. I think Habjolokia is alluding to that as well. Even if it was outdoors, a lot of pepper plants have the lower leaves yellow and die off. No biggy.

Light burn from a wet leaf. If it is the only one like that then do not worry about it. Also it may be from salt damage if you are applying it as a foliar feed.

This happened yesterday. The leaf had a little bit of a brown spot and was kind of yellow - the soil was bone dry on the top and bottom of the plant and it was drooping a bit. I watered it, the other leaves perked up and this was the leaf a few hours later. I only did the Epsom spray once about a month ago whatever is happening is still causing it currently - like I said happens in a day

This happened today - totally different plant - plant hasn't been watered in 4 days, and as I said I bottom feed (sit the plants in a pot of water for about 10 minutes and let them soak up from the bottom what they need) so except for the Epsom spray a month ago - the leaves are never wet. These ones were small newer leaves at the top. So literally, I noticed they were curling/yellowing a bit yesterday, didn't do anything, and I just got home and it looked like that and was broken off (it's just sitting on the other leaf)

I don't understand it - like I said in my original post, it's different plants, can be top or bottom leaves, the leaves are never wet, and I have seen no bugs. The only thing I thing is weird is a kind of fungus that I can see thru the containers but I've been told not to worry about it. One question I have - because I have clear containers(I know I've heard that's not good)what if the root that feeds that particular leaf is under the light too much that day could that cause it? Only thing I can think of with the randomness

Can you take some photos of the entire plants, containers and all?

How do the bottom of the leaves look?

Ex you asked for more pics

They went from cells, to small cocktail styrofoam size cups, to solo cups, to now they are all in 2 liter soda and milk containers.... Most of them have ThIer roots already hitting bottom so I'm thinking about transplanting soon

The above 2 pictures of of plants I topped, and then the fungus I was talking about Apparently it's due to the clear containers and sunlight hitting the roots/not enough breathability, but not harmful to the plant

And peppers can you elaborate on "what do the bottom of the leaves look like"? Do you mean the tips or the undersides?

Took pic of underside of leaf. Shiny crystallized stuff. Used magnifying glass and stared for a bit - no movement, no bugs. Had a plant that had mold feeders long ago - microscopic white things that teemed in the soil so I know what ur talking about ... These Plants were planted indoors with store bought soil dec. 9 and I live in Massachusetts - trust me these plants have never been outside, by an open window, or exposed to pests.