It's happening on page loads that are instant (or near instant).
It's nothing that is taking more than 5 seconds at most, and the server connection time-out is set to 120 seconds.
I can guarantee you nobody is waiting 120 seconds for this error to pop up.
I did do a forced restart of LSWS and that appears to have cleared up the 408's however I am a bit curious about the one page load where the php script was attempted to be downloaded instead of processed - even if very rare this is dangerous especially with config.php, configuration.php, and other such script configuration files.
I would also like to add that when the "download 408tester.php" popped up - it was more than 30 minutes after doing the LSWS restart.