XPS 14z Wireless/HDMI connectivity issue

Hello,

The wireless connectivity/speed of my XPS 14Z gets disconnected/packet lost/slow after connecting to the external monitor using HDMI port.

All drivers are updated/latest.

Dell has replaced the motherboard/wireless card after reporting this issue!

The issue has not been solved!

Anyone has any idea what might be causing this? Please note that I have tried different monitors/cables, the issue is the same.

Thank you in advance.