Ezrun 5.5T combo fault

[Neil78]

I have a Ezrun 5.5T combo have ran it at 2 race meetings and has performed perfectly.I have just fitted back into my buggy from my truck and I know have an intermittent fault where at full throttle the green light goes to red and power is reduced.This fault also occurs with the break.I have charged batteries and rebound hand set and speedo.Also a friend of mine has the same system and he has had the fault from the first time he used it.Has anybody else experienced this fault or know what could cause it.