My Posts: All Forum Topic
First of all, I assume you are correctly turning on your Tx first before powering up your quad. Also helps if you wait 10-15 sec after powering the Tx before powering on the quad (esp if your tx is dsm2).
Other thing to check is that the nano's antenna is not laying flat on the control board. Lift it up 30-40 deg.
Hope you manage to sort this out but at least is sounds like it still works ok after re-binding. This does not take all that much longer anyway imho.
Ion-x, 10s ,SS
TT X50E 10s, HC3-Sx