Import failed due to an unknown error. Check the Web Inspector console and network tabs for errors

good morning,
suddenly I started getting error 500 in the Ghost backend, in the posts-published tab, from the console I was seeing tens of thousands of errors, it looked like a log of my entire database.

i exported the database and imported to another ghost instance for testing purposes. I was encountering the following error:
check that the import file is valid JSON .: Unexpected token t in JSON at position 12224571

The Json of the database is about 80MB, I have a bit of difficulty opening it and inspecting that line.

I tried to do a new import without changing anything, and I encountered this new error:
Import failed due to an unknown error. Check the Web Inspector console and network tabs for errors.

But apparently all posts are imported to the test server, none are missing.

While on the production server I no longer encounter error 500, without having changed anything.

Is there any control I can do to not carry this error with me over time?