No, but maybe power down, disconnect the power cord, and remove then re-fit the link plugs. Then re-connect and power up.
I’m guessing from your profile you don’t have an NPX 300 connected.
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As @MrFixit says take all leads out and put back in and check link plug. There is a loose connection somewhere.
That would have been my immediate thing to do!
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Thanks will give it a go tomorrow
If no joy then speak to your Naim dealer.
i have had it a couple of times on my 222- i thought a momentary power cut ?- have put it into standby and wakened and everything ok