Turning to the community for opinions and advice. Any further troubleshooting advice is appreciated.

My new V30 has Wi-Fi connectivity issues on my home network.  It is the only device that has issues on my Wi-Fi network. Two different laptops, two different phones (Droid Turbo, iPhone), and Nintendo Switch, all connect and maintain connection with no issue.

I've tried basic troubleshooting: 

• Whitelisted the MAC.

• DHCP reservation.

• Increase DHCP lease time.

• Switched Wi-Fi channels on both bands to zero or low population channels for my area.

• Adjusted phone settings to not use Wi-Fi for location with GPS.

• Turned off "avoid bad networks".

I can be sitting 10 ft from the Wi-Fi source with full signal, and the connection will drop. It drops, and IMMEDIATELY reconnects, sometimes switching bands (unless I disable one). The drop interrupts any ongoing data transfer (crashing apps and games). The drops occur at random intervals, sometimes 2 or 3 times in an hour, sometimes 1 or 2 times over 2 to 3 hours.

I've sent this phone in for repair twice, for this and other issues. The second repair, they gave me a new IMEI # with the repair note "board replaced". I am left to think only a few possibilities:

1) The phone's Wi-Fi antenna or/and chip was not part of the "board" and I'm still stick with defective ones.

2) There is some random and obscure incompatibility between V30 Wi-Fi hardware and my modem router gateway.

3) There is a V30 software setting I'm missing somewhere on the phone that causes this drop.

Anyone have any ideas?