That happens to me as well, i have the A3 hardware, running on 1.32 firmware. If i manually set the channel, it doesnt even connect and it crashes. What i do is that i just leave it to automatic scan.
My primary channel is ch.5 and secondary is ch.1
thats the way how i set that up, although i dont know how. All i did was put it to channel 5, and then after i save the settings, i switch it to auto scan and now my primary is ch 5.