SOLVED Spark, stereo pair Phantom -dropouts. What Wireless Wifi Router to purchase?

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As described above in my case it is the PLC of Phantoms and Dialog that matters when the Phantoms are not connected by ethernet cables but 'wirelessly'. While playing a Qobuz stream via Spark I can turn off and on again the Wifi, even reboot it without interrupt. So the wireless is not used for syncing the Phantoms.