Being a 2018 hopefully rust/corrosion aren't big players in the picture (they may be). I would look for a loose connection in the battery feed. The other thing I would check is the battery; it may be a 2018 but there is no telling what kind of battery was installed on it at the dealer; water levels etc. If it doesn't have it, I would install the 2nd 12v battery "just because".
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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