What could be causing this spike at 60Hz?

FargateOne

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Preamp, Processor or Receiver
Rotel RSX-1562
Additional Amp
Bryston 3B3 for fronts mains
Universal / Blu-ray / CD Player
Cambridge CXU
Front Speakers
B&W 804 D2
Center Channel Speaker
B&W HTM4D2
Surround Speakers
B&W 705
Subwoofers
SVS PC-2000 and SVS PC-2000 Pro
Other Speakers
10 PEQ filters/channel in receiver with REW
Video Display Device
Samsung UN55ES8000
Other Equipment
miniDSP 2x4 HD
I have a 2010 Asus laptop and a miniDSP Umik-1 since 2015. All worked well with REW and Dirac 3.0 for my thousands of measurements done since then. Yesterday, during the night so in a completly silence environment ( during the day Dirac mic level reads -48issh dB but last night in a more silence room mic level was -41dB) this 60Hz appeared every where. It is NOT a Hummm. My Arcam AVR-21 is dead silent even if I push the main volume at 90 (usually 55-62). With one point measurement only the spike is in all channel but surround left and sub right. In a 9 point measurement withthe help of the propagation window, the spike is in all channels.
I know I can check with REW (need to find a moment for now)but in the mean time what is a probable cause? usb cable? mic itself? Dirac software? or worst of all my receiver?
Fronts
1762438573761.png

Center
1762438607671.png

Surrounds
1762438631507.png

Subs
1762438658609.png
 
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