Fortin-All installed on 2010 Ford Taurus, only works sometimes not always.

Question

I installed the FORTIN-ALL system into my 2010 Ford Taurus with Push Start. Install went smoothly and upon first test it worked great. After the first test it only works at random now. Brake lights will light

up a few times but it won’t start. Firmware is up to date, using the recommended taurus push button start. It works at random so I know i wired it and programmed it correctly for the most part. What am I missing?