Script Broken Overnight

Question

I have a script that was supposed to update somewhat frequently- a couple times a day. It collects data from other sheets and compiles them into a master sheet. All of a sudden I started getting error reports in my email. I have not logged into the drive or edited the script at all, but I suddenly started getting this error:

"We're sorry, a server error occurred while reading from storage. Error code NOT_FOUND."

I tried running the script, same error. The sheet has 4 scripts, none will run. I then tried to edit the script, but it would not let me save it. I tried to create a test script to check permissions, but it would not let me create a new script. No permissions around this page have been changed, I have absolutely no clue what could have caused this. I did try clearing cookies, changing browsers, incognito mode etc. No avail. I tried adding logging, but I can't add logging, and it's not even getting far enough to encounter an error to log.

Any help would be great.

Edit

I was looking through old error logs and found the following: 6/28: Exception: Service Spreadsheets failed while accessing document with id

It then ran fine for a couple weeks, before generating this error on 7/14: Exceeded maximum execution time

It then ran fine until same error. Ran fine a couple more days until it turned into "server error" and "Not_Found" error. Since "Not_Found" error started on the 24th, it's been constant and I can't edit, fix, or test the script.

edit2 I also cannot Show "appsscript.json" manifest file in editor. I don't really understand, but it's like I'm locked out of my own script. I tried my colleagues computer, same issues. Makes no sense to me.

edit3 I was able to duplicate the container sheet and the issues were still at play. I duplicated the scripts and it was still at play. I was able to open the original scripts, copy their contents into a blank sheet, save those scripts, and then attach those to the duplicated container sheet, and now it works. However, I am very concerned about what happened to create this situation and how to address it in the future. Obviously something happened while I was not using my computer that broke everything.