Please refer to my previous post https://whysun.com/computers-and-the-internet/surface-pro-7-wi-fi-fails-to-turn-on-after-wake-from-sleep/
I have still not yet received updated Win 10 version 20 04 on my Surface Pro 7 so I have been checking Windows Update every morning.
This morning I noticed a number of system updates involving various Intel components. After installation, I checked on the Intel Wi-Fi Network Adaptor and it has been updated to driver 21.80.2.1 (dated 25/2/20).
Therefore, I changed All Settings / System / Power & Sleep so that the computers goes to sleep after 10 minutes on both battery and when plugged in. Then I waited for about 30 minutes and on waking the computer the Wi-Fi was connected and worked correctly. I repeated this a couple of times throughout the day and it appears that the issue has been fixed.
The new driver number (21.80.2.1) is different from the one on the Intel site (21.90.3) so I am glad I had second thoughts about updating from the Intel site and waited for an update via Windows Update.