Security indicator dashboard light always on (2021 Mazda3)

Hello All!
New user here. 2021 Mazda 3, 35999 miles and of course an issue ....
Need some help with security indicator dashboard light.
1. It stays always on (car armed or disarmed). What I noticed is that light is kind of slightly dimming on/off ( I mean barely noticeable). Wondering could it be main battery? It has been only 36 months and car is in hot/humid Houston.
2. I replaced key fob battery
3. Key fob is working as expected, closing, opening, starting engine
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