I have been having some issues with the a BigBox V1.1 Hybrid Titan model crashing the bed into the print heads. The previous owner Installed a PEI sheet on the glass bed. It homes great and levels sometimes and others it seems as if the IR sensor does not see the bed and it drives the bed into the nozzle and i have to power it down to fix it. Has anyone had these issues? I am very suspicious that the white grid lines are causing me issues. I would like to upgrade the firmware on the unit. Is there a preconfig firmware for the bigbox duel hybrid titan v1.1 ?