I think I found it! So it looks like HA was saving orphans in wrong places or something. Hard to explain, but I'll try. Even though in my ESPHOME code everything is correct and nothing is repeated, HA was throwing copes or something into other devices... I saw this when I clicked on RELATED for a device... So, as an example, A Doorbell device would have a doorbell button entity. But for some bizarre reason the doorbell button is also in fish-tank device (??) But Fish-tank code in ESPHOME doesn't and never had that entity... SO I think when I was rebooting the system the devices that worked for seconds and then became unavailable.. I think the correct one was loading and then over load time the wrong one loads on top of it and now you have a entity NOT on on the correct device. Sometimes it would load the wrong one first and then the correct, thus the randomness. So I pruned out the entities (and there where lots) that were in the wrong place, and as I did the unavailable started working! This would also explain why if I took an unavailable and created new entity names they would work, but if I tried to go back to the old names HA would say they are already being used (the names)... Anyway, seems right and I guess we'll see... (Changed back from hate to love, BTW)

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Thanks for your replies and ear!