QubesOS updater does not start

I am using QubesOS R4.2.1, and I saw the update notice in the upper right corner, so I clicked on it and am trying to launch it, but the updater doesn’t seem to launch. sometimes Vault and Untrusted don’t launch when I try to launch Atom and Xmind, either. Most of the time, it launches on a whim. Does anyone else have the same problem with the updater not launching as I do?

Vault , as well as Atom/Xmind in Untrusted, I was able to start and update the updater just now after trying to launch it several times over a period of time! Good to know that it will not start up for any function other than the app.