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Buenchico & Togo. I spoke to Intel and they told me that there is a driver embedded in the Creators Update that conflicts with Toshiba's drivers, preventing the internal wireless from operating properly.
This morning I received a communication from the Microsoft forum to remove update KB4034674.
On boot-up the networks came back wirelessly, but the internal wireless adapter Intel N-7260 kept dropping out every couple of minutes. However, when I added my new USB adapter, which became WiFi 2, I had a steady wireless connection. So, apart from losing a USB port (one out of four) I'm now up and running and the cable has been put away. For how long remains to be seen. Thanks again to you both for your enlightening comments.