We have similar issues, randomly, especially on large ERDs, editing the model, then it quickly stops to respond at auto save and crashes with this error

curl equivalent queries worked.

worked for me, should be enough, thanks for helping with this trick :)

/drive returns unsupported message:

{
"http-status": 404,
"message": "Unsupported API call.",
"status": "error"
}

has it changed name ?