Small Transport; Low Wing; 2 Turboprop Eng
Air Traffic Control Fully Certified
Situational Awareness
Conflict Airborne Conflict; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Overcame Equipment Problem; Flight Crew Returned To Clearance
Aircraft; Human Factors
Aircraft X was at 110 direct GVQ which was about a 050 heading. He suddenly turned to a northwest heading estimated to be about a 340 which [had] him directly in the way of Aircraft Y who was direct VWV at 110. I turned Aircraft X to a 090 heading in order to keep separation. He said his autopilot shut off; to the controller working the next sector after I switched him. [Also]; my D-Side had Toledo Approach descend Aircraft Y.
ZOB Controller reported an aircraft had an autopilot failure resulting in a conflict with another aircraft.