INTERMITTENT IGNITION ISSUE

Years ago, I had a battery that was slightly loose in the battery tray. Sometimes when I made a left hand turn, the car would die and it would start right back up. I cleaned all of my ground connections but that didn’t solve it. After many weeks of frustration, I noticed an arcing site on the inner fender next to the positive battery cable. Seems that the battery would shift and the positive post would contact the fender and short the system. I turned the battery around in the proper orientation and made sure the hold down was very secure. That fixed the problem.
I’m not claiming that that is your problem but I do suggest that you check your positive cables and leads in addition to the ground connections.