Hello,
I have one spreadsheet, named "BO". I could access and modify it in the morning, but now when I try to, I get the "Internal server error" message. I tried with different browsers, private mode etc. When I download the file from my drive, it is empty. When I copy the spreadsheet and access the copy, it is empty.
I can create a new spreadsheet and access it normally.

EDIT: For whatever reason it did work, both accessing and downloading, on Windows. But it's still the error on Linux and iOS.
EDIT2: Now it works on Linux too.