ATTiny3227 wont program with voltage on AIN6

Hello. I have a potentiometer's output on PA6 (AIN6) on an ATTiny3227. When the potentiometer's output is at ground, the ATTiiny will take an upload of a program just fine. When I turn the potentiometer, the ATTiny crashes and my light doesn't blink, serial comms stop, and I can't program it. This happens two boards. I have the pin set to input: pinMode(POT_LVL, INPUT);


3.3v rail is still up, I don't see a short anywhere. Anyone have any ideas? Net name is "POT_LVL"