I can't tell you how to program your radio, I don't know why your getting red flashes on your RX, what I do know is, you need to pull the manual or call the maker of your radio and find out what is going on with it. If your radio RX is loosing communications with your TX, you have a serious problem and it probably will stay in failsafe.
Work on one thing at a time, personally I would be making phone calls to find out more about it. You could have a faulty TX or RX, maybe both, call the support number on your documentation and tell them what it is doing.
You have been playing with this too long, it has to be a problem with your equipment. If your receiver does not see your radio, failsafe will normally activate on the Naza.