After installing OPCache and enabling the DSO PHP Handler, I occasionally get "startSession(); $app->execute(); ?>"

This only occurs sometimes, and a quick page refresh immediately fixes the issue. Is there anyway to make this error stop popping up. It seems to occur more frequently for the Opportunities module than for any other module.

When clicking on a module it will say:

Error Occurred:

“startSession(); $app->execute(); ?>”

We are running:

PHP 5.6.28
CentOS 6
Apache 2.4
SuiteCRM 7.5.1
MySQL 5.6

There were no errors in the error_log or access_log files.