I've been having every problem you've explained with my Solo such as Gimbal not detected, Video freezes, etc. and when it does detect, the video is only good out to about 150' from where I take off, then it freezes. Video worked great until I upgraded the 3DR Solo Services app on my Samsung Galaxy 5S phone. I'm at day 29 on my solo and I'm ready to send it back (got the RMA already). I also have the GoPro Hero 4 black, and made sure the firmware was update on it. Sometimes there's no video at all, sometimes if I boot the Solo several times, the video turns on. Other times it says the GoPro is not compatible - results are always inconsistent. Very frustrating, have had several tickets into 3DR. They direct me to a RANGE link (make sure antennas pointed in right direction). That's definitely not it because I am flying in the middle off the desert and there is not Wifi interference (can't detect other Wifi signals).