Hi Thibaut,
A network reset should resolve this.
• Turn off all players and other network-attached devices (laptops, tablets, and smartphones – Airplane mode can be enabled).
• Unplug any wireless extenders or repeaters you may have in your home.
• Unplug your router. Wait for 30 seconds and plugin again.
• Wait for 5 minutes (important – do NOT skip the wait time).
• Turn on all wireless extenders or repeaters and wait for 5 minutes. (Skip this step if you do not have an extender/repeater).
• Turn on all players and network-attached devices (laptops, tablets, and smartphones – Airplane mode needs to be disabled).
• Relaunch the BluOS App.
This will reset your network router’s cached addresses.
But the solutions will last only few weeks, and you have to do it again if hiccups restart.
The problem is still not resolve by blue sound, and they don’t want to take it in consideration, thinking it’s a Roon problem which is really a shame.
I am going to buy another streamer leaving blue sound and NAD for ever.
I hope it will resolve temporary your issue.
You have also others topics on this issue you can read
Random crackles sounds in speakers only using Roon - #32 by Alois_Noebauer
Crackling with bluesound devices - #11 by Guy_Neuhaus
Some of them speaks also about a blue sound factory reset; it works also for few weeks.
keep me inform
Guy
PS are you french because your name sound really french?