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Answers
inspect wire/connections inbetween positive battery post and starter for any corrosion/issue. also you can parallel that wire with a single jumper cable to see if that cures a starter-won't-engage/no-crank condition.
could be flakey/intermittent starter-motor or solenoid. next time no-start occurs, maybe you can try giving a couple solid raps on the starter motor with a tire iron while someone tries to start it, to prod the solenoid to kick out the starter motor gear.