I thought this may have been related to the other post regarding .htaccess code flushing, but it looks like a separate thing.
Plugin: BPS Pro
Issue: When checking/selecting the Developer Options >>> PHP Errors — Enables sensor for alerts generated from PHP option and visiting any of the BPS Pro plugin pages some kind of large dump or object flush happens. BPS Pro has a plain text php error log that logs php errors. When visiting any of the BPS Pro plugin pages with the php error option selected 20MB of data is dumped into the BPS Pro php error log plain text file and BPS Pro plugin pages will no longer load since it appears that 20MB is also trying to be loaded in each BPS Pro plugin page visit.
My hunch is some sort of object flush gone whacky. Still looking through your code.