@Eplak
I have looked at your original posting, and also this one, a duplicate.
Let's try to make some progress.
This still appears to be an interference issue. It is not clear whether other USB 3.0 devices also cause this problem. Also, have you tried:
1 - An extension cable to move your USB 3.0 slightly away from your Surface Pro 4
2 - Using a different USB 3.0 device, does it have the same issue
3 - Using this USB 3.0 device on a different PC, but nearby your Surface Pro 4, to see if interference continues
Bad link. that's counter to the long usb cable distance theory though.It is important to note that most interference occurs with the router, not the PC (end client). Shielding the router, with the exception of its antenna would be an important thing to try. Also, changing out the router might be necessary.
One of many discussions here.
You may actually have a bad device. I no longer have an SP4 but when I did I tested a bunch of USB devices and cant say I recall having an issue. Also haven't had any issues with my S2, S3, or SP3. I wonder if making a contact between the USB plug metal shell and the SP4 case would help yours. It would also be interesting to see if a USB wifi adapter would make any difference with or without long cables. maybe a wifi rabbit ear antennaIf I plug any USB 3.0 stick into my sp4 I lose all wi-fi connections. It's a pretty significant design flaw imo (regardless of who is to blame). Not everyone can just connect via 5 GHz.
Bad link. that's counter to the long usb cable distance theory though.
You may actually have a bad device. I no longer have an SP4 but when I did I tested a bunch of USB devices and cant say I recall having an issue. Also haven't had any issues with my S2, S3, or SP3. I wonder if making a contact between the USB plug metal shell and the SP4 case would help yours. It would also be interesting to see if a USB wifi adapter would make any difference with or without long cables. maybe a wifi rabbit ear antenna