After losing 4 HDMI inputs on two separate Vizio TV's I've come to the conclusion that it is due to the Co-Star. A few days after I received my Co-Star I get a blue screen with an error message on HDMI input 1 that says "invalid format", so I switch to HDMI 2. A few days later HDMI 2 starts displaying the same thing. I thought ok I've had the TV for almost 2 years I guess anything is possible. So, I contact Costco concierge service and they hook me up with Vizio to get a replacement. I received the replacement on 10/6. On 10/8 HDMI input 1 again displays "invalid format", so I switched to input 2. Now today 10/9 input 2 now displays "invalid format" I've switched HDMI cables, switched devices and inputs, unplugged all devices with no luck. If anyone has any thoughts I would certainly appreciate them.