Anyone have issues with Solo and controller losing contact while flying. Had it happen the other day, Solo returned to home and landed safely. Was not able to reestablish the connection after many tries (including rebooting everything, changing battery, etc.). Was about to try to connect with another controller but gave it one more try and it connected with the original controller. Thought I was going to find either a bad controller or receiver in Solo. Just curious what would cause the intermittent problem with loss of signal.