not an agm issue, its a rare battery issue but can happen with any battery. physically bad internal connection.I am not familiar with AGM batteries in a car. Is the intermittant failure a known AGM problem?
I had one that would intermittantly drop a couple cells and wouldnt start car.. measured ~~ 8-9volts IIRC. but of course it would start working again.
I had no warranty issue because it was 5 years old.. just replaced it once we determined it wasnt bad starter etc.
Dont ask me what kind of construction failure it was.. I didnt disassemble it to find out..
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