Wi-fi disconnects at 60-second intervals between TPCast powerbox and TPCast router

[ghost]

I'm experiencing a problem with OpenTPCast 2.0.1. For background, the stock TPCast software and equipment work fine. I'm only seeing the problem when the powerbox is updated to use the OpenTPCast image.

The TPCast powerbox comes online fine and connects to the TPCast router. VirtualHere successfully finds all of the Vive devices and I'm able to configure them. SteamVR sees everything and starts up. But every 55-60 seconds it briefly loses the connection. After 3-5 seconds it reestablishes the connection and is running fine again. That cycle continues forever... 55 seconds good, 5 seconds bad, repeat.

Troubleshooting:

• I've removed everything else from the equation: No Windows, no VirtualHere, no Bonjour, no Vive. Just the TPCast powerbox as a wifi client connecting to the TPCast router, and the problem still happens. I can SSH into the powerbox and watch the disconnects/reconnects occur with a persistent ping between the powerbox and the router (55 seconds of <1ms successes, 5 seconds of failures , repeat).
• I've verified there's no traffic congestion for the TPCast router. I followed all of the troubleshooting recommendations for wifi standards, frequencies and channels, and none of them changed the behavior.
• I've verified that other devices (like a PC) connect fine to the TPCast router via wifi, with no disconnects, just consistent <1ms pings.
• I've verified that if I switch back to the stock firmware, the TPCast powerbox connects to the router just fine, with none of the recurring disconnects.

Have there been any other reports of similar issues with OpenTPCast 2.0.1?

Someone on the TPCast discord recommended updating the wifi driver. I don't know much (if anything) about Linux, but via SSH to the OpenTPCast version of the powerbox I think I was able to determine that the current driver is 8812au, version v5.1.5_19247.20160830. Is that correct? If not, is there a particular driver I should try to update it to?

Here's the information I pulled via SSH:
pi@tpcast:~ $ lsusb
Bus 001 Device 004: ID 0bda:0811 Realtek Semiconductor Corp.
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
pi@tpcast:~ $ lsusb -t
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/5p, 480M
|__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M
|__ Port 3: Dev 4, If 0, Class=Vendor Specific Class, Driver=8812au, 480M
pi@tpcast:~ $ modinfo 8812au
filename: /lib/modules/4.9.59-v7+/kernel/drivers/net/wireless/8812au.ko
version: v5.1.5_19247.20160830
author: Realtek Semiconductor Corp.
description: Realtek Wireless Lan Driver
license: GPL
srcversion: 53DD8711F5E6E9D6FEB542D

Please let me know if there's any additional information I can provide to identify the problem.

Thanks ahead of time for any assistance!