I only know the following information because I'm a nosy parker.
Several ISPs are rolling out infrastructure upgrades in the form of hardware and head-end software. For quite a few cable customers, DOCSIS 3 is being tested as well as enhanced BPI+ finally being implemented.
Rogers, Comcast, Telstra, BigPond, Charter, Earthlink, and quite a few others are actively making changes. That has been causing QoS issues and total down-time - sporadically.
Perhaps that explains why some have had issues and others have not.
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