335 CCA sounds bit low to be honest, I'd go 520 next time you're buying a new battery.

Could it be dropping a cell from time to time? had that happen before. Check what your voltage is before cranking it, then get someone to crank it...shouldn't drop below 10.5V on the start. Just above 14V when running and above 13.5V with all the lights/amps (if you have any) on.

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