Aeon MultiSensor 6 Draining Batteries

I have two Aeon MultiSensor 6 installed at the very same room (for testing) with the exact same settings. One of them has been working fine for several months, but the other, which I installed just a few weeks ago, has been draining batteries. While a set of batteries lasted for about 6 months or so on the unit that’s is working properly, the malfunctioning one has already gone through 3 sets of batteries in a couple of weeks.

I was initially using a custom device handler by Robert Vandevoort on both units, but decided to remove both units from the network, hard reset them, and re-add them with the default Smartthings device handler. I don’t know if this will take care of things, but I thought it was worth a try.

Also, I noticed some interesting things looking at both devices in the IDE. The unit that’s working properly (not draining batteries) shows the following in the data section:
configured: true
endpointId: 0
fw: 1.6

On the other hand, the unit that’s draining batteries only shows the following in the data section:
configured: false

Also, there’s a difference in the “Raw Description” format on both devices. The working unit shows:
0 0 0x2101 0 0 0 f 0x5E 0x86 0x72 0x59 0x85 0x73 0x71 0x84 0x80 0x30 0x31 0x70 0x7A 0xEF 0x5A

While the broken unit shows:
zw:S type:2101 mfr:0086 prod:0102 model:0064 ver:1.06 zwv:4.05 lib:03 cc:5E,86,72,59,85,73,71,84,80,30,31,70,7A ccOut:5A role:06 ff:8C07 ui:8C07

Could any of these discrepancies explain the battery drain issue?

Any help is really appreciated.