Hotspot keeps disconnecting

I find that the hotspot shared from my iPhone 12 to my mac or iPad frequently disconnects. The hotspot works. I can select it from the list of available networks. It connects and I get internet access. But, sometime later, I'll discover that I am no longer connected. I connect again and sometime later discover that I am no longer connected. This cycle repeats. It is annoying.

I have checked "Automatically connect to this network". My devices do not automatically connect to the hotspot network.

This problem has persisted across multiple reboots of both devices. Also across upgrade to the latest version. This has been a problem for year.

I have read a few articles about how to make this feature more reliable and have take all recommended actions.

What is up with this? I would like tips on how to fix this. however, I feel I've tried everything at this point and the problem is in some coding decision that I don't have access to.