Safari Extension won't fill if too many tabs open

Folks, I am having an intermittent problem where the 1Password extension will not autofill. You clink the icon in the web page, nothing happens - no pull-down menu
If I use the icon at the top of the browser, it can recognize the site, but when I click autofill, it won't work.
1Password and safari are both updated

Solutions I've found - quit and restart Safari - very inconvenient
Open a new safari window - much less disruptive but still annoying

This sounds very similar to the problem reported ~3 years ago at: Autofill stops working on Safari tab | 1Password Community, but that user was using beta Safari version,,

Thanks in advance for any advice and hopefully a solution!