Mail accounts keep going offline and then back on again

I am using Mail 4.4 on OS 10.6.6. I have 9 different email accounts in my inbox from 4 different domains. All the domains are hosted on a reseller account so they are all on the same server. Mail is scheduled to check mail every 5 minutes and each time alternating accounts go either on or offline. This behaviour also happens on my iphone 4 with IOS6 and ipad 2 with IOS5.
I am using the same setup and OS as I have been for the past year or so and it has been absolutely fine up until a few months ago. My ISP is being helpful and they have replicated the problem on one of their Macs but it doesn't happen on a PC. They are puzzled also.
I read somewhere that the mail app has a short time out where it takes the account offline if there is no response and that having all email accounts on the same server might cause this problem. Not sure if this is correct advice however.
I have turned off some of the accounts so that only 2 are in the inbox, its still happening but not as often. Anybody have any suggestions as its driving me mad.

My brother and mother are having the same problem. We all three are on SBC Yahoo! DSL and all share GoDaddy-based email addresses. I'm clearly on a different part of the SBC Network - as I have rarely had problems with mail accounts kicking me offline, whereas they have the same problem you do - accounts are random and inconsistent when they kick offline.
I've tried to research whether it's a GoDaddy, SBC or Mail issue. Thanks in advance!
Mac OS X (10.4.6)

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Mail accounts keep going offline and then back on again

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