Product large file downloads NOT working

Hello,

We have a store where the product is a file around 250MB.

The download would always fail at 53MB.

After some investigation and digging around it seems like the output buffering was enabled before sending the file, and when that buffer get's full the script would fail.

I do not have direct confirmation of this, however adding this code in the sendFile() function solved the problem...

        // make sure output buffering is OFF!!!
        while (ob_get_level()) {
            ob_end_flush();
        }