I bought the Vizio 215 about a month ago. When listening to tv shows, the voice volume constantly is changing from normal to low. I had it hooked up via hdmi buy changed it to digital optical cable toslink. Same issue. Is this normal or do I have a lemon?
You mentioned this was a problem with tv shows. What about DVD/BD? Have you checked out the tv speakers to see if the same thing happens when using those instead of the Vizio?
I have the VIZIO S4251 and it does the same thing. Strange thing is, if I rewind my DVR it will fade in the exact same spots every time. If I turn off the Vizio speakers and use the TV speakers, there's no fading in and out.
Connected to a Visio TV via optical.
I turned off both the psuedo surround effects and volume leveling and all worked well for the next fourteen months until the Vizio was demoted to temporary master bedroom duty.