My Atlas seems to occasionally crash/lock up and stop transmitting. The red LED in the battery compartment doesn't flash. I've got to pull the batteries, leaving them out for around 30 seconds.
When I put the batteries back in it starts transmitting again.
I check the batteries when I pull them. Battery voltage for all 4 cells is around 1.42Vdc. So the Atlas should be getting around 2.8Vdc.
The problem seems to be occurring more frequently. I've had the problem now on 12/19, 2/23, 3/21, and now 3/30. The unit is at least 2 years old so definitely out of warranty.