DNS Query Issues

Good day I seem to be having intermittent DNS issues w/ T-Mo home internet. 

Connectivity to tower is good 500 down 50 up on average

Good constant pings to a remote site, personal VPN establishes and stays connected. 

I have the black 5G square tower looking gateway

Firmware version: SGJi10205-1.2.B4

UI version: v1.9.0

Troubleshooting steps tried:

Moved GW, no change. 

Rebooted GW, no change.

Factory reset GW, no change. 

Set static DNS on clients, no change. 

Sometimes it’ll work, sometimes it won’t. Spent about 1.5 hours on the phone w/ tech support and the last person I was bounced to didn’t know what DNS was… I have constant pings running in the background to 192.168.12.1 (GW), 192.168.0.1 (VPN remote site), and 1.1.1.1 (cloudflare DNS) and they never drop. Is there some sort of port 53 or UDP filtering on T-mo’s side that is causing this issue?

I am not sure when this started as my T-mo gateway is at a remote location that I haven’t been to since December. It has been an issue since I’ve been here (the last 3 days). 

When I turn wifi off on my phone and connect to the tower directly I have no issues. 

nslookup outputs:

GW DNS

> github.com
Server:  FWDR-192.FWDR-168.FWDR-12.FWDR-1
Address:  192.168.12.1

DNS request timed out.
    timeout was 2 seconds.
*** Request to FWDR-192.FWDR-168.FWDR-12.FWDR-1 timed-out

> github.com
Server:  FWDR-192.FWDR-168.FWDR-12.FWDR-1
Address:  192.168.12.1

Non-authoritative answer:
Name:    github.com
Address:  140.82.113.3

Cloudflare DNS

> google.com
Server:  one.one.one.one
Address:  1.1.1.1

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
Non-authoritative answer:
Name:    google.com
Addresses:  2607:f8b0:4004:c07::8a
          2607:f8b0:4004:c07::8b
          2607:f8b0:4004:c07::64
          2607:f8b0:4004:c07::66
          142.251.163.102
          142.251.163.138
          142.251.163.113
          142.251.163.100
          142.251.163.101
          142.251.163.139

> github.com
Server:  one.one.one.one
Address:  1.1.1.1

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to one.one.one.one timed-out

> github.com
Server:  one.one.one.one
Address:  1.1.1.1

DNS request timed out.
    timeout was 2 seconds.
Non-authoritative answer:
Name:    github.com
Address:  140.82.113.3

Any assistance or advice would be greatly appreciated.