If this is only an intermittent problem, I would look for other causes such as type & octane of gas being used and also any additives being used (some octane boosters will destroy sensors). If you can't narrow it down that way, I would run it until I dared not go any further (to empty the tank) and then fill up with the highest octane, top tier gasoline that I could find. Then use only that brand/grade of gasoline for several tanks and see if that solves your problem.

Good luck.