Yes the Mac goes into sleep mode, but as I said never had a problem before. And no Chrome message.

Usually happens when I come back to my iMac after being out for a few hours. I am using Chrome version 65.6.5 and Mac OS High Sierra.

Never had this until this version, driving me nuts.

I have done that, can't figure out why the extension unmounts. No new extensions, but this one was updated I think.