Why do my hdmi ports keep getting fried?

Thank you Vernon Taylor for your suggestions. There has never been a sign of a burn, etc. at the ports. Our original electrician checked the ground, etc. several times and said it was good. The area where this TV is the only area we have had electrical issues. We also had the propane line going to our gas logs get struck one evening (same area/wall). We didn't know that is what happened until the next morning when I heard a small explosion (thank God I was home). I ran to the area to find a torch of fire coming from the fireplace. Fire Dept. came, etc. and had to tear the wall out because it was still hot. Investigator could not determine a cause. Power company came to check the ground and said it was fine but we have insider information that their ground at the transformer was not sufficient. We already had some of the best surge protectors at the outlets but we added a whole house surge protector from the power company after the fire. A couple months went by without any additional issues. Then the HDMI issue returned... just hear a pop each time and "no signal" appears. Had a different electrician inspect and he found the the power company had good ground but the original electrician did not have their ground connected to our panel box. We hoped for sure this was the problem all along but we have been through this 3 times now since early Summer and so no more HDMI ports are working. Sorry for the lengthy reply but it is a long long story. Thank you Vernon Taylor for your suggestions. There has never been a sign of a burn, etc. at the ports. Our original electrician checked the ground, etc. several times and said it was good. The area where this TV is the only area we have had electrical issues. We also had the propane line going to our gas logs get struck one evening (same area/wall). We didn't know that is what happened until the next morning when I heard a small explosion (thank God I was home). I ran to the area to find a torch of fire coming from the fireplace. Fire Dept. came, etc. and had to tear the wall out because it was still hot. Investigator could not determine a cause. Power company came to check the ground and said it was fine but we have insider information that their ground at the transformer was not sufficient. We already had some of the best surge protectors at the outlets but we added a whole house surge protector from the power company after the fire. A couple months went by without any additional issues. Then the HDMI issue returned... just hear a pop each time and "no signal" appears. Had a different electrician inspect and he found the the power company had good ground but the original electrician did not have their ground connected to our panel box. We hoped for sure this was the problem all along but we have been through this 3 times now since early Summer and so no more HDMI ports are working. Sorry for the lengthy reply but it is a long long story.

I have only one thought just now and it is a bit wild. I remember how it was discovered how some CO2 fire extinguishers were sometimes ineffective - the jet of gas was causing a build up of static electricity in the plastic horn; enough to cause a spark that would reignite the fire it was being used on.
I wonder if your basic problem is a static buildup and discharge? I wonder if your propane line (or something else) is becoming charged by the movement of gas inside or by the sudden release of pressure at the nozzle or inside the pressure regulator or gas control?

Electronic equipment containing CMOS circuitry is extremely vulnerable to static discharge. Perhaps it is local or perhaps the entire wall is becoming charged...
What do you think? I have only one thought just now and it is a bit wild. I remember how it was discovered how some CO2 fire extinguishers were sometimes ineffective - the jet of gas was causing a build up of static electricity in the plastic horn; enough to cause a spark that would reignite the fire it was being used on. I wonder if your basic problem is a static buildup and discharge? I wonder if your propane line (or something else) is becoming charged by the movement of gas inside or by the sudden release of pressure at the nozzle or inside the pressure regulator or gas control? Electronic equipment containing CMOS circuitry is extremely vulnerable to static discharge. Perhaps it is local or perhaps the entire wall is becoming charged... What do you think?