Hang both collars somewhere at the same level with the antennas facing up and try it again... Danged ole dawgs will go lay down and mess the whole deal up.
Travis, I did that with the same outcome...
Did you do the update to your 320?
Mike, I bought a new unit with the collar... It already had the update...
The 50 communication number was 48 an the 40 was 14...
Not sure how much that makes a difference... I thought I remember a higher number is better...