IMAP accounts dropping on and offline

I have a problem with IMAP accounts in Mail, all of which used to work fine. They keep dropping offline, and then tell me the password is wrong. I enter the correct password (I've double checked this) and sometimes it rejects it. On other occassions however it does go online, downloads new messages and is fine for a while but then drops offline again to repeat the problem.
Sending mail from these account is not a problem, and the fact that they do work intermittently suggests it is not the settings themselves. What is causing this very annoying problem?

Some ISPs refuse connection attempts if they are too frequent, or limit the number of simultaneous connections that are allowed from the same IP address. If those accounts are all hosted on the same server, that could very well be the problem.
What’s the time interval chosen in Mail > Preferences > General > Check for New Mail? If it’s set to Every minute, try changing it to Every 5 minutes.
Turn OFF Preferences > Accounts > Advanced > Automatically synchronize changed mailboxes for all the accounts if it’s checked for any of them.
Do you access those accounts from more than one computer or some other way (e.g. webmail) while Mail is checking for mail?
Go to Apple Menu > System Preferences > Network, choose Network Port Configurations from the Show popup menu, and make sure that the configuration used to connect to Internet appears at the top of the list. Leave checked (enabled) only the port configuration needed to connect to Internet and Built-in Ethernet (in that order if not the same), uncheck (disable) the rest of network port configurations and see whether that helps — if it doesn’t, turn ON again the ones you want enabled.
Try using a different method to connect to Internet, if possible, or connecting the computer to Internet as directly as possible (i.e. bypassing any routers that might be present, using an ethernet cable instead of wireless, etc.), or shutting down both the computer and the router/modem used to connect to Internet, restarting, and see whether that makes a difference.

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