Only able to fix rclone certificate error over ethernet (it won't work over wifi) Why?

rclone will run fine for months at a time. The command I run most often is:

rclone sync {{path/to/file_or_directory}} {{remote_name}}:{{path/to/directory}}

Then - _seemingly out of nowhere_ - I run my rclone sync ... command and get the following error:

failed to open source object: certificate has expired or is not yet valid

I always do the same thing, issue the following commands, and the problem usually goes away:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install --reinstall ca-certificates

Occasionally running those three commands above does not work, and I'm forced to take drastic actions: 1. Disable wifi 2. Connect to a router through an ethernet cable 3. Restart the computer 4. retry all of the commands above (upgrade, reinstall ca-certificates, rclone sync *) and somehow the ethernet connection fixes everything. **Why do I occasionally have to use an ethernet cable to make my rclone certificate errors go away?** I don't always carry an ethernet cable on me, and even if I did it's not always easy to connect to the router that is offering you wifi access. I do not really know the root cause of the problem, and how to fix it.