Internet Keeps Often Disconnecting After The Initial Email Check In A Synchronize All

For me, a Synchronize All often disconnects from the internet after checking my only email server, but before checking any of my newsgroups servers. I found the Accounts screen for my email account; nothing is entered there. All the email and newsgroups accounts have a checkmark before Include this account when checking for new messages.

However, when doing a Synchronize All, I sometimes but not always get an error message after the check of the email server, but before the check of any of the newsgroups servers, saying there is no longer any connection to the internet and asking if I want to try the connection again. When I tell it I do, the connection is usually restored within a few seconds.