I have five Roku devices, four of which are Roku 2's and one that is a Roku TV. Four of the five are connected wirelessly. The audio drops out only on the local CBS channel. The video on this same channel is fine. All other TWC channels are fine. Apps, i.e. Netflix, Crackle, VuDu, are without this problem.
One Roku 2 is connected with a Net Gear plug wired through the house electrical system. This Roku 2 is viewed on a 60" Panasonic 3D tv and does not have the audio drop out problem that other Roku's do.
While it may seem like it is a wireless problem I have checked the Roku's and they are up to date and have been restarted as has the modem and router without a resolution to the problem.
Looking for your help in resolving this issue.