System disconnects from building antenna during sleep.

Its an old card but use to work flawlessly. It started acting flaky during one of Microsquish's update for Windows 10.

Funkyecat said:

Its an old card but use to work flawlessly. It started acting flaky during one of Microsquish's update for Windows 10.

Did MS update the driver for one of their own? Have you tried rolling back the driver? If that works, you can disable further driver updates.

Enable or Disable Driver Updates in Windows Update in Windows 10

I uninstalled the driver and rebooted. Same driver came back. However, 2 consecutive sleep cycles over hours apart have come up fine. I'll leave it alone for now.