I had an issue like this a long time ago ( 3 years or more ) And it ended up being my modem was going bad. The fact that its happening to all your accounts on any PC in your house kind of rules out it being PC related. game related or anything on Bliz end IMO. It has to be someplace in your connection..ISP..router..modem..IMO
You should try a trial of another MMO ( or a FTP version ) and see if you DC from that as well, if you can handle that. I say that because if its an intermediate DC issue with your ISP or connection hardware, its hard to tell.
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