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XPS 9350 Thunderbolt Display issue when connected to 802.11 2.4GHz

When I have my WiFi connected to a 2.4GHz wireless router my display (connected to Thunderbolt 3 StarTech HDMI connector) disconnects frequently.  Both the monitor connected to the Thunderbolt 3 and the laptop monitor flash 2-3 times and then comes back and starts working again.  And then it repeats again minutes later... and again... and again

If I change to a 5GHz wireless router... then everything works great.

Please help

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