Engine light on,,

Hi All, i have recently purchased a 55 plate Tiger 955i was running fine then engine light came on and ran extremely rich, as the bike was under warranty i was told to take it to a triumph dealer to have it repaired ,,this was done and two days later the bikes throttle went to idle whilst doing around 50 MPH and the light came back on.So back to Triumph where they cleared the fault and had the bike for two days to try and re create the problem,it ran fine for them so i picked it up and its been fine until this morning and its done it again throttle shuts to idle ,engine light on ,turn bike off ,Restart and its fine ,rides fine , but the light remains on,,,,,,AAARRGGGGHHH Help.

 

Many Thanks its looking like a faulty throttle position sensor and isw going in for repair under warranty