Plugging power cord while recording music - zero input

This is a strange problem when recording music via an interface:
When I am recording sound (Amadeus Pro) via a bus-powered firewire-S/PDIF-interface having my 2012 MBA on battery, and during recording I plug in the power cable, there is a complete zero input for one second or so (shown as -infin dB). Sometimes it goes with digital artefacts. Sometimes this also happens when doing other commands while recording.
Possible reeasons:
Core Audio goes down
power for the external interface goes off
I never had this problem with my earlier MBP and SL.
Anybody?

Hi, Jim. Your guess is exactly correct. The DC-in card to which the port is soldered needs to be replaced. It will probably cost at least a couple of hundred dollars to have a technician replace it, or if you're handy, you can buy a used part and replace it yourself for about half that amount:
http://www.ifixit.com/Guide/Repair/Installing-PowerBook-G4-Aluminum-17-Inch-1-1- 67-GHz-DC-In-Board/255/1
http://www.ifixit.com/PowerBook-Parts/G4-Aluminum-17-Inch-1-33-1-5-1-67-GHz-LR-D C-In-Board/IF155-052

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