Severe short term audio distortion when watching Netflix

Hi all , I can't find a reason for this anywhere - so posting as widely as possible

My Setup

New Win 10 PC with Matrix Element H USB card - Sablon 2020 cable to May KTE DAC - handmade Silver XLR's to Hegel H390 to Dynaudio Heritage Specials

For the last 12 nights, while watching Netflix or Youtube - the audio is swamped by severe high pitched distortion for 3-4 seconds , then all returns to normal

This only happens once per night - between 7 -10PM. Only once, never during the day and only for 3-4 seconds - all was good for more than the last 12 months with this current setup

I have contacted my internet provider - all is good from their end - have checked with a speed test as soon as distortion starts and speed is normal

I have replaced the Ethernet cable

I have uninstalled and reinstalled the Holo Audio driver for my MAY KTE DAC - on a suggestion from Microsoft Support

I have rebooted  PC several times and switched off May DAC and unplugged power cord for 30 seconds

Any ideas or suggestions appreciated




I'm guessing the PC.  go to a roku streamer for $40 and see if the problem goes away.  Or I can loan you one I'm not using. 

I'm not saying permanently switch.  You figure out what your configuration should be.  But for troubleshooting, get the computer out of the circuit and see if the problem goes away.

Thanks - I don't have a TV - only PC monitor - and know nothing about streaming

I'll ask my mate who built this PC for me to investigate the Process monitor angle

I've been shown how to access real time process monitoring from the task bar - I'll bring up that window at 7pm tonight and see if anything spikes during distortion.

What sort of interference do you mean  - I live in a ground floor apartment in a group of 5 - as far as I'm aware - my neighbours all use laptops - don't know if that info is of any use