Is the cassette done up tight enough?
I’ll say yes, cassette hasnt been touch and I’ve not known a cassette to come loose before
Is the wheel flexing?
I did have the wheel trued and tensioned to see if this was the cause and the issue continued
is the bolt attaching the derailleur to the frame done up properly? I’m guessing it is, so maybe worth checking for play in the parallelogram – I’ve had to replace an eagle mech before due to play, it wasn’t obvious while shifting in the stand but when moving the mech by hand you could see it quite clearly.
Yeah, hanger is tight as is the mech into the hanger, I think it being NX and having 750miles-ish on it might be wear in the parallelogram, will give it a check shortly, was hoping there was fix as opposed to a dent in my bank account or a new mech!