I might be having a similar issue. I sent my TH to Carolina Dronz, to have them install the external antennas (I'll be installing the 4HAWKS Raptor, myself, once I receive everything back) on the H, and to replace & focus the CGO3+'s lens with something better than the stock Yuneec lens. Before shipping it, everything was working. Since purchasing the H, I've had no noticeable problems. The closest I could consider as a "problem" was that I lost video feed when the H was approximately 1/2 mile away, and hidden (ie.no longer visible) behind a large hill. Prior to going behind the hill, H & CGO3+ strength were both quite good, but about 15 seconds after the H was hidden behind the hill, I lost video feed..then, about 15 seconds after that, I lost connection to the H. To me, this was nothing more than a "lost connection, due to distance" matter.
Anyway, after Carolina Dronz had installed the external antennas, according to what I've been told, they got to work on the CGO3+. according to what I've been told, the camera would not connect. I do not know if this was before disassembling the camera, after disassembling & before replacing the lens, or after the replacement lens was installed. The initial email I received about this was as follows:
"We have the external antenna kit installed on your unit. The technician is working on the lens installation however he noted that there are issues with your camera connection. Yuneec has advised that it sounds like the WIFI board needs to be replace. Do you have any input on this?"
I responded by informing them I had mentioned this to someone in Ireland (I'm in the US), that he had said he knew who the tech was, and that he'd call him to provide additional troubleshooting & advise. The reply I received back was as follows:
"I'm still waiting for some direction from Yuneec. I see the WIFI board for $29.99 on their website but I want to make sure that it's programmed before we move in that direction. Yuneec did instruct our tech on how to reset the board and that was unsuccessful.....it looks like the WIFI board will need to be replaced."
Regarding the person from Ireland, he messaged me the following:
"Well not god news I'm afraid. Camera is fuc!^%. There was no WIFI connection and no red/green light. He attempted to do a reset with the camera w/o success. He attempted internal investigation and found nothing. Sometimes a loose connection between the 5.8GHz cloverleaf antenna and the transmitters main board will eventually burn out the transmitter. It's not a loose connector but could be a bad solder joint. No antenna, no resistance, and you immediately have burn out. With a loose connection or a cracked soldering joint it will happen over a period of time. It's not a problem with the camera or gimbal. It's a problem with the 5.8GHz WIFI transmitter in the camera. There is power to everything but "no lights on" for the transmitter. The problem is that the transmitter is behind the camera and inaccessible. It's a pain in the arse to get at it, and a pain in the arse to change it. Then the gimbal will need a reflash and reboot. Not possible unless Yuneec do it at their repair centre. The WIFI board is also not available as a spare part. It's only available "in house" at a Yuneec repair centre. It's definitely a preexisting problem. There is really no way to damage the WIFI board doing a lens swap. It's also impossible to dislodge the cloverleaf antenna's connection even if you yank on it because it's sandwiched between two boards. I've seen loose connections and cracked solder joints. Yuneec Germany replace them straight away if there's no sign of external damage. I don't know if Yuneec USA will do that. To dislodge the WIFI antenna by yanking on it is near impossible...they sandwich it between two boards at the back of the camera."
Again, I've never had any problems. The last time I used my H was approximately 1-2 months ago, and, other than that one occurrence of complete signal loss (H & CGO3+), due to distance AND being behind a hill, I had absolutely no problems. Making matters worse, the warranty is expired. Has anyone else experienced any identical, or similar, problems? If so, have you been told the same things I'm being told? If so, can you PLEASE provide any helpful information...the sooner the better, and the more useful the better.