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After 13 months of flawless display, my TV decided to only recognize one of the 4 HDMI Ports. Although I have 4 devices connected to the 4 ports, I can only see one device and that same device is displayed on all 4 ports even with the other devices plugged-in and switched on. I have upgraded the TV to the latest firmware. Changed all the HDMI cables, plugged and unplugged all the devices one at a time, reset the TV and disconnected from my network. Nothing seems to work. Samsung Technical support said they never heard of this happening and could offer no help except to set up a service call. Any ideas??