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Itermittent starting issues should have both the charging system and starting system checked.

Check the wires and connections for the battery, starter, and alternator. Connections clean and tight? Wires have any insulation worn off or interior corrosion?

Check the serpentine belt. Has it stretched passed the usable limit? Is it cracked?

Check the belt tensioner. Is it applying good tension. Is it's pulley turning freely?

Have your battery, alternator, and starter tested. A lot of chain stores will perform these tests free of charge.
Good luck and post back with your results. :)