Yosemite mail won't connect with isp

using yosemite and mail 8.0 on a mac mini
restarting computer sometimes fixes this temperarially.
the the connection fails again in an hour or a day.
deleting the mailbox and re setting it up also fixes this, till the connection fails again
what is wrong?

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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