Irobot runs without pushing power button

Question

Whenever I snap my battery into my irobot Discovery 4210 it starts running. If I push the power button, it won't turn off. If I press Max or Clean, it works. It's very annoying not being able to turn it off without taking the battery out. I cleaned it out completely with an air compressor, just in case any of the sensors were covered in dust and it still didn't help. Any suggestions?