Gmail continuously disconnects from the internet in Chrome -- all other sites work fine.

Question

All day today (and possibly before, as I use a couple of different machines/devices when I work from home) Gmail has been repeatedly disconnecting from the internet and not connecting again. I have a wireless connection, but it is steady, and even while Gmail won't load, other websites load fine. When it disconnects, I see the "connecting in..." countdown, which stops at 1 sec every time. Nothing happens when I manually click "try again now." Refreshing the site is the only way to fix it, and it only stays connected for about a minute or possibly less before disconnecting again, getting stuck, and requiring refreshing.
It doesn't appear to happen in anything but Gmail -- Drive and Calendar both seem to be working fine. I haven't changed anything (no new extensions or programs on my computer, no different firewall settings, etc.). I have noticed that the background color of the tabs and bookmark bars in Chrome suddenly changed to a very dark gray/black, and this may have happened at the same time the Gmail disconnection problem began.
This is happening in Chrome--I haven't been able to replicate it in other browsers. I use Windows 10 on a desktop. I can retrieve email from other devices, so I will be able to see replies to this.
Hope someone out there can help, and if you need other info let me know. Thanks in advance!

Jeff S Oly · Accepted Answer

Just to note that the problem I am having is in Firefox - disconnecting Gmail every about the same time (noonish PDT) day. I have been able to get Gmail back by restarting Firefox. Sometimes with problems, but usually takes just a time or two. I am not having problems with other browsers, but I do spend almost all of my time in Firefox.

._. · Accepted Answer

Everyone that still have this problem, please check this. When Gmail 
disconnects, before you go clear the cache, try to open Google Photos. 
In my case, Google Photos will give me a blank page too. After clearing 
site data only for "mail.google.com", Google Photos will also be 
accessible again. Not sure if its only me or not.

David Forbes · Accepted Answer

I have the same issue so I won't repeat. I have found a simple F5 to refresh the page to be a simple, yet annoying, work around.

Amos Shapir · Accepted Answer

#metoo.  Started happening (I suspect) since the last upgrade of Firefox.  This also happens on Outlook (accessed via the site outlook.live.com, not the app), though not as often.
So far I see 230 people with the same problem, none with a solution.
WORKAROUND: Remove cookies.
Click on the menu icon (top right corner) then: Options -> Privacy & Security -> Cookies and Site Data -> Manage Data.  Select mail.google.com , click "Remove Selected" then "Save Changes" and confirm.
Return to the Gmail page, and refresh.  It comes back to life, but latest changes made after the point when it got stuck are lost.

Federico Akerman · Accepted Answer

Try updating to the last version of Chrome, then restart Chrome, and, if needed, your PC.
I have had 12hours without problems so far