electrical issues and strange sounds
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when you said the starter was sticking I thought you meant that aweful noise you hear if you keep the key turned after it has started. Your saying it will stick, not make a sound for a while, but the longer it is on it will start to grind? Will we need a new starter?
If the noise goes away you need a new ignition switch.
Report back after you try this and let us know if giggling the key fixes it or not.
I am betting it does.