I have never had this problem before. It just started today.
When I go to do the datbase backup and I choose .sql rather than .sql.gz (compressed) I get this error:
Error 500 - Internal server error An internal server error has occured! Please try again later.
If I choose to save the backup as sql.gz (compressed) then I get NO error, it downloads the file ok.
How is this happening all of a sudden? No problems last week! I have made no changes to the system. Everything is the same yet this just started happening on 2 of my php sites today.
5XX HTTP errors happen then server stops himself from sending data due detected errors for example. what version of PHP and MySQL you have, and server type(Apache or IIS)?