WiFi Connection Issues: Windows 10 Update + Qualcomm QCA461x4

[jpball]

Deep breath here...and apologies for the detail

Yoga 710 141KB
Qualcomm QCA461x4 WiFi/Bluetooth chipset. Driver 12.0.0.722
Home Network consists of 2 routers: Xfinity 2.4/5 and Netgear WNDR4000 2.4/5

Coincidence? Everything has been running just fine for months/year until the recent Windows Migration Update 1903. Following the update, I am frequently unable to see all of my available networks; often unable to connect to my 2.4gHz networks or connections to my 2.4gHz networks are abhorrently slow (circa 150kbps vs historical 40-100Mbps. 5gHz networks all perform satisfactorily (circa 350Mbps)

What have I checked?
- WiFi adapter was migrated and restarted with the Update
- Rebooted all routers
- Confirmed other devices connect and perform on all available wireless networks
- All MSFT Windows 10 updates. Current Build 8362.329
- Qualcomm driver is up to date
- WLAN report confirms "WLAN AutoConfig service failed to connect to a wireless network"

Network Adapter: Qualcomm Atheros QCA61x4A Wireless Network Adapter
Interface GUID: {174c33f5-8d51-4a13-be43-71f314403905}
Connection Mode: Automatic connection with a profile
Profile Name: WhitneyNew2.4
SSID: WhitneyNew2.4
BSS Type: Infrastructure
Failure Reason: The driver disconnected while associating.
RSSI: 255

Or....

Wireless security failed.

Network Adapter: Qualcomm Atheros QCA61x4A Wireless Network Adapter
Interface GUID: {174c33f5-8d51-4a13-be43-71f314403905}
Local MAC Address: 94:E9:79:F7:60:49
Network SSID: whitney2
BSS Type: Infrastructure
Peer MAC Address: A0:21:B7:73:F3:F1
Reason: Dynamic key exchange did not succeed within configured time
Error: 0x0

Wireless security stopped.

Network Adapter: Qualcomm Atheros QCA61x4A Wireless Network Adapter
Interface GUID: {174c33f5-8d51-4a13-be43-71f314403905}
Local MAC Address: 94:E9:79:F7:60:49
Network SSID: whitney2
BSS Type: Infrastructure
Security Hint: PSK mismatch suspected

WLAN AutoConfig service has successfully disconnected from a wireless network.

Network Adapter: Qualcomm Atheros QCA61x4A Wireless Network Adapter
Interface GUID: {174c33f5-8d51-4a13-be43-71f314403905}
Connection Mode: Automatic connection with a profile
Profile Name: whitney2
SSID: whitney2
BSS Type: Infrastructure
Reason: The network is disconnected by the driver

I will take any advice or assistance offered!

Thank you,
John

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