Step light not detecting motion?

I have 2 step lights, both in the same group. The status page shows both are connected to my Bridge - Good signals, good battery levels (100%) FIrmware 1.8.4-20.Here's the issue - 1 unit detects motion, no problem - both lights come on then that first unit detects motion - perfect. Now the second unit, doesn't detect motion at all! They both appear to have similar settings - if either detects motion - both lights should come on for 30 seconds. Again, this works great on unit 1, but not at all from unit 2???I have adjusted the motion sensitivity on both - to high. Unit 2 still detects nothing.Also - in my app history - unit 1 motion detection is logged, unit 2 (the one not detecting) has no motion history, but does show the light on and off (because of unit 1) .What should I do, or check to get unit 2 detecting motion? They are on different corners of the house and I desire motion detection in both places.I do not have any schedules defined - all motion alerts should be good, 24/7. Both units have motion detection enabled (I cycled that setting on each already too - no change). Neither the group, nor the devices have a schedule.Thanks for the help.