MMM V3 - random glitching

[PBO]

I have searched for this scenario but I there are so many I hope this may be quicker? This isn't my vehicle...

So it's a Losi 8ight B with the full Tekno conversion (including the clutch), running a V3 with a Neu 1515 1.5F on 5S & 6S, 46/18 for general bashing & it's mated to a Spektrum DX3. There's a second fan installed on the motor

The glitching randomly affects throttle only, lasts up to 10 seconds but may happen several times per battery

Any thoughts or advice?

PS, appologies if this has been answered previously