GL-AR150 noise

If I listen closely I can hear some component making a noise near the base of the case. If I saturate the wifi connection with iperf the noise gets louder. It sounds similar to a really feint mechanical HDD. It’s like a ticking/scratching sound.

Is it normal? What component would make that noise?

edit: after reading online, I assume it’s the DC/DC converter?

Sounds like coil resonance of the DC converter.

a tiny drop of glue might do the trick (or silicone, nailpolish, paint, latex) Whatever can dampen the noise / vibration and does not cause a shot circuit or act as a solvent. (as you don’t want to dissolve the plastics of any component either)