Internet disconnects problem

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Occasional Visitor
PROBLEM:
After start-up my Windows 10 desktop PC connects automatically to WiFi with Internet access. GoogleDrive and Dropbox sync successfully. About 2 to 4 minutes after start-up, the Internet access is disconnected although the WiFi connection remains intact. Internet is still available on other devices (smart phone, laptop) using the same WiFi. This happens whether applications on the PC such as email are opened or not.
 
To restore Internet access I have to disconnect and reconnect (sometimes more than once) to the WiFi network on the desktop. Here after Internet access remains without a problem until power down.
 
This problem happened before after a Windows update. Somehow I resolved it with the attempts mentioned below. It returned - not sure but probably again after a Windows update.
 
ATTEMPTED TO FIX:
I have researched and attempted all possible solutions that I could find on the Internet without success. This includes:
Uninstalled and re-installed the WiFi adapter
Moved the WiFi adapter to a different USB port
Changed the power management setting for the WiFi adapter
Checked that the WiFi adapter has the latest driver
Rebooted router
 
MY EQUIPMENT:
Desktop PC with Windows 10 Home 64-bit version 1903 (up to date with the latest updates installed)
CPU is Intel Core i7 6700 @ 3.40GHz processor
16GB RAM
Gigabyte Motherboard
Internet connection with fibre optic - uncapped, 40Mbs download
ZyXEL WiFi router in a room 2m x 4m where all devices are used
EDIMAX 150Mbps Wireless 802.11bgn Nano USB Adapter
Avast antivirus software
Google Chrome internet browser
 
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