[Aloisius]

Depends on what one considers a "problem." As long as the autopilot's failures conditions and mitigation procedures are documented, the burden is largely shifted to the operator.

Autopilot didn't prevent slamming into a mountain? Not a problem as long as it wasn't designed to.

Crashed on landing? No problem, the manual says not to operate it below 500 feet.

Runaway pitch trim? The manual says you must constantly be monitoring the autopilot and disengage it when it's not operating as expected and to pull the autopilot and pitch trim circuit breakers. Clearly insufficient operator training is to blame.