Have you contacted Jeti USA yet? Or called Aeropanda? These fellows will be able to help you much more than us on the forums.
I've had my DS-24 since they 1st came out. Each time I had a bug and I thought my transmitter was defective, I discovered that it was something that I did wrong. James & ZB at Esprit and Danny from Aeropanda were always there to help. Also, David, LA Jet Guy is super-knowledgable and helpful.
Don't give up. Once you have it sorted you'll find it is a very reliable and robust system.