mac startup commands not working drive erased

It'll ask me to set preferences for apps that launch on login, it'll ask me to reauthorize apps that I've already been using and are already authorized in the 'Privacy' tab of Security & Privacy in System Preferences. The other bigger thing that'll happen is I'll boot into a user account, and it'll act like it's the first time it's ever booted into that account. I tried troubleshooting that behavior on its own, but nothing I found worked. Even trying to search for applications to launch from spotlight doesn't work. Then, when I click on 'Recents' in the finder, it's blank. Then, after roughly an hour or so (I can't pin it to any particular trigger, or any length of time, it happens even if I don't touch my machine) the index erases. After a regular reboot, the machine starts to index again, and that process finishes, and it works for awhile. The biggest is that, no matter how many times I delete/reindex, remove from spotlight privacy and put back, my Spotlight index gets corrupted/erased, so I can't search for anything on my drives.

Click to expand.I've had a bunch of weird problems with Big Sur.

Mac startup commands not working drive erased