over 90deg. some of them stop setting

Could be the plant is setting what it can handle as far as available nutrients (you never get all blossoms set), though could be impacted by heat or humidity (yet that is much more of an issue with larger fruited types).

When it cools off a little, they will usually start getting fruit again.

It's probably the heat, then. I have them growing in containers, staked up against a white wall that gets a lot of heat. I'll be sure to do a lot of feeding to sustain the growth. The two sungolds I have eaten thus far were sooooooooo good.

They're not the only ones. Flies, moths, butterflies, hummingbirds, and even random beetles and spiders will pollinate. Our yard is full of clover so we're flooded with bumbles and honey bees this year. Any sign of blossom-end rot on the fruits that do set? If so, their feet are too wet. It's been a weird season.

pollinated last year. I have planted several "bee friendly" plants, and this year everything is fine.

tomatoes are self pollinating.

Some plants have to have two different plants (and in the case of kiwis, a male and a female), but a lone tomato plant will produce. In that context it is self-pollinating, but you still have to have insects to distribute the pollen between flowers. Bumbles do the heavy lifting on our nightshades. I've never heard of a plant producing without pollinators. Perhaps I have some research to do.

I had tomatoes that ripened in November because fruit set in September.

day time temps > 94 degrees for a period of time cuts down the pollination %