Mail stops checking for new mail until closed and re-opened

This problem began a month or so ago and is only getting worse by the day. I have my Mail app set to check for new mail every minute, but recently it randomly stops checking at all and displays the triangle icon next to each Inbox. I have 10 different email accounts that I use Mail to check and they are a variety of different types from Exchange servers, to IMAP accounts, to POP accounts, iCloud, Outlook.com, Gmail, etc. Part of the time only 2 or 3 inboxes are affected, while other times (more recently) it’s ALL accounts. Clicking on Get Mail doesn’t help; no new mail is downloaded. The only way to get Mail to “wake up” is to close the app and then re-open it. When I do that, there is a flood of new mail that pours in to each account that had been offline. There are never any error messages telling me that anything has happened. I just know that Mail is stuck because of the triangle icon.
Also, there are times when my busiest account mysteriously has no new messages over a few hours, which is very unusual. Closing and re-opening mail will resume downloading mail again to that account. At least for awhile...
I thought I’d solved the problem by thinking that my router was only working intermittently, so I replaced it with a new Time Capsule. The problem did not go away.
I’ve talked to Apple Support and they’ve not been any help. I’d welcome any suggestions.

Troubleshooting Apple Mail
What does Mail/Window/Connection Doctor Show? If the server is red, select it and look at the Show Details box.
Troubleshooting sending and receiving email messages
Troubleshooting sending email messages
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Alan,
Refresh my memory: what type(s) of account are you
using -- POP, IMAP or .mac?
Since I believe your setting up a new User Account,
and Mail in it worked, did you ever remove the
com.apple.mail.plist, and cause Mail to need to be
setup again? To do this, quit Mail, and in the
Finder open Home/Library and locate the Mail folder.
Control-click over the Mail folder, and choose
Duplicate -- then drag the resulting copy to the
Desktop for temporary backup. Next, open
Home/Library/Preferences and find the
com.apple.mail.plist file and drag it to the
desktop.
Relaunch Mail, which will open as though new, and
when prompted to import anything DECLINE.
Instead, re-enter your account info, and Mail will
re-discover the account for this account, and all
should be well.
Sorry that I have not had time to go back over every
one of your prior posts.
Ernie

Mail stops checking for new mail until closed and re-opened

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