If this mod is only sourcing power from the machine, there is no reason for instability other than power supply overload.
I'd suggest contacting Spooky or Ben Heck to determine if the stock game can handle all these mods or if an auxiliary supply is needed. I noticed similar weird behavior right after installing the laseriffic topper which never returned after that first power cycle. I had the shaker installed from the factory.
I have the living dead girl and a few other mods waiting to be installed on the machine but have not gotten to it yet.
Maybe the game just needs more power?