I have two of these cordless handset units, one on a 5340, and one on a 5360. Intermittently one will lose mic audio and it requires re-pairing and restarting the phone then it will work for a while. I just got another to be able to have one to swap in and out for testing and it seems to do similar. However when brushing the mic I can hear the loopback echo on the handset so the mic does work, but I don't hear the audio on the phone I've called to test with.
Anything to test, check, thoughts, ideas?