Unable to download submissions if file is big.

[martinoesterreicher]

We are trying to download the submitted files with 186 and 191 attempts, resulting in 670MB and 580MB files.
The download starts and all seems fine until the download randomly aborts at around 410-460MB for the 670MB file and around 350MB for the 580MB file, resulting in an error "Error - no file".

We have tried with multiple different quizzes all resulting in the same error.

[louisaoc]

We've made a comment here with regards to time out issues on the download process: https://moodle.org/plugins/quiz_downloadsubmissions