Anet A8 board flashed with Marlin feedrate speeds up spontaneously without user input


#1

I have an AM8 and I flashed the board with the latest Marlin (1.1.8). I recently discovered that if the LCD is not plugged in the feedrate will spontaneously but gradually increase without cap. Plugging in the LCD mid print will stop the increase. Any idea what could cause this electrically?