Hi
I have had this problem on a P60 and it was fixed by John Redman giving me new settings for the ECU . This was a factory style setting and is not an open adjustment ( ie you cannot do it without expert approval as it is within the ECU basic settings unavailable to us mortals) However IT WORKS !!!

I have now done 12 hours + on the ARF Boomerang /P60 and 10 of them with the new settings. It NEVER misses a beat at any time.

Well done that man Redman and thanks again as I had at least 6 overtemp cuts and compromised the model each time so I may have not got away with the seventh !

David