I assume no info changed in the downtime, ie... db user credentials in config.php, then the issue is indeed on their side, the error would show a different msg if those credentials were wrong.
I would guess at this point as i dont have server access, that its timing out trying to connect as the db server is to busy.
Check these variables for sql in the admincp:
connect_timeout = ?
interactive_timeout = ?
wait_timeout = ?
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