Replaced both Main and Aux Battery 2 months ago-Aux Switch Not Available Again

[Trdogs55]

2018 JLUR had been giving me "auxiliary switches not available" for a couple mo and finally just replaced both batteries. Everything has been great until last week when it started up with the auxiliary switches not available again. I have power steps running through one of the aux switch and that's the only additional powered addition to the vehicle. They've been on for over a year and a half with no prior issues. After the jeep runs for 3-4 minutes, the aux switches come back online. Any help in diagnosing the issue would be appreciated as I don't have much experience in battery issues. Is there a test for the steps that I can see if it's pulling too much power or is it most likely a faulty Aux battery after two months , or.....???? Thanks in advance!

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[58Willys]

If everything is good after driving a few minutes, your batter are running low. If you don’t drive every day, you need to put it on a charger/maintainer. Just the way these things are.