WiFi keeps dropping, internal Intel adapter to AT&T Netgear modem, Ubuntu 20.04

This is an insidious problem that is driving me nuts, and I have run out of skill.

Ubuntu 20.04 LTS on a Chuwi laptop with Intel 9461 wireless chip. Works flawlessly when connected to most WiFi, including my T-Mobile Pixel in hotspot mode, and the household Netgear WAP.

When I connect to the AT&T hotspot (Netgear MR1100) using WPA2-PSK, I get periodic disconnects/reconnects.

journalctl -u NetworkManager reveals the following:

Jan 14 16:45:06 Biscayne NetworkManager[954]: <warn> [1642196706.3760] sup-iface[0x563fc2a5e920,wlo2]: connection disconnected (reason -4)
Jan 14 16:45:06 Biscayne NetworkManager[954]: <info> [1642196706.4092] device (wlo2): supplicant interface state: completed -> disconnected
Jan 14 16:45:06 Biscayne NetworkManager[954]: <info> [1642196706.4093] device (p2p-dev-wlo2): supplicant management interface state: completed -> disconnected

for each time the connection drops. It then immediately scans and re-connects.

When I connect through the aforementioned Netgear WAP, the connection ultimately ends up at the very same AT&T MR1100. And if I plug in my ALFA wireless adapter via USB, I can stay connected directly to the very same MR1100. These disconnects only occur between the on-board Intel 9461 and the MR1100 directly.

dmesg|grep iwl shows the following:

[ 5.694167] iwlwifi 0000:00:0c.0: loaded firmware version 46.4d093a30.0 9000-pu-b0-jf-b0-46.ucode op_mode iwlmvm
[ 5.702677] iwlwifi 0000:00:0c.0: Direct firmware load for iwl-debug-yoyo.bin failed with error -2
[ 5.776285] iwlwifi 0000:00:0c.0: Detected Intel(R) Wireless-AC 9461, REV=0x318
[ 5.828964] iwlwifi 0000:00:0c.0: base HW address: f8:e4:e3:98:99:eb
[ 5.877346] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[ 6.009380] iwlwifi 0000:00:0c.0 wlo2: renamed from wlan0
[ 11.408323] iwlwifi 0000:00:0c.0: Conflict between TLV & NVM regarding enabling LAR (TLV = enabled NVM =disabled)
[ 8852.250007] iwlwifi 0000:00:0c.0: Conflict between TLV & NVM regarding enabling LAR (TLV = enabled NVM =disabled)

My firmware is up to date (amd64 1.187.25).

I'm not sure what to look at or try next.

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