The only good part here is the fact that they visited your place so many times including someone from the factory

I too am considering the GX800D TV.
If you are thinking that they visited my place 4 times just by logging a complaint in their Service centre ; then my friend please delete that perception.
When i raised the issue to their Service Centre; 1st time a person came from service centre and went back after spending 1 hour and as usual the very next day the reply came that " this not an issue. TV is working as per specification".
So ; i escalated that to panasonic escalation email id mentioned in their website . But invain..no one bothered .
So after 1 week i mailed to their India MD . Then within an hour i got a call and this Time Panasonic Service Manager (Not Service Centre) booked an appointment . But this time also that service manager came and dint even bother to update me for a week ; and after a week i got the same response as above.
So this time; i escalated with harsh word to India MD along side some Japanese Region Head. After this escalation the 3rd & 4th visit happened. On the 3rd visit Panasonic's South Region Quality head came and then he confirmed that its an issue and they will look into it. But they told me that People from their Manufacturing Plant would like to visit .
That was the 4th visit. The irony was that ; the guy came from Factory ; he was still trying me to convince that this is not an issue . But later they got convinced that their bullshit was not going help me to get convinced. In this whole story i found the Quality Head professional and logical enough.
After all this Panasonic have asked me to pay additional 24K to replace with GX800D or refund .GX800D has MRP 104000 and FX730D has MRP 160000. They dint disclose the MRP even after asking 3 times . I had to get the GX800D MRP personally from Panasonic Brand Store.
The Service people in Panasonic are bunch of money sucker.
I have taken the decision to get the refund. If i have to pay more money i would go for OLED or Sony higher end models.