I do agree that it is odd that you started having this issue after switching to Shaw for phone service. However that seems to be the most unlikely cause; and the single hardest one to troubleshoot. (ie- get Telus phone service back to test it out.)
As for different machines being affected differently, that is possible. If the phone is close to the frequency instead of being right on, different network cards could handle the interference differently.
The only other thing that comes to mind, how close is the Shaw phone router to your Network router? There could be some interference going on there, but I doubt it.
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