Shuts off while driving

I have been trying to diagnose a problem for a few weeks now. I was driving at seventy mph on the highway first time it happened and RPM's dropped to zero. Shifted to neutral and made it over two lanes to the shoulder. Tried to start a couple times while still tolling then after coming to a stop. No go. I shifted the car into park then first then park again figuring maybe some kind of sensor. Still turns over but no spark. I took the key out of ignition and put it in the auto shift over ride key slot and shifted from first back to park while pressing key a couple times. Put key back in ignition and it started up. I think this was a coincidence.
Next day coming home from work, went through a traffic light and saw tachometer drop to zero again. Pulled over and tried to crank but nothing. Same thing with key in the shifter slot and moved shifter a couple times. Started right up. This happened once more the following week but that time had to wait longer until it finally started after twenty minutes. Weather was hot over eighty five degrees each time it happened and AC on. Checked battery/alternator and other connections in the mean time.

Now a week later and I get to a job site, backed into parking space and car cut off as I backed up. Would not start again. Went inside and returned after one hour still would not start. Opened hood and pulled distributor cap off and checked wiring cap and rotor. Banged on top of distributor, put it all back together and it started right up.
Decided to replace cap, rotor, plugs and wires since had not been done in 25,000 miles. While I had it apart I removed the coil and checked readings, everything okay. Loosened all nuts and cleaned and tightened back down. Car starts and runs fine. Back to work yesterday, left office to run a call. Car starts and runs fine until I pull into a parking space and car quits. Come out half an hour later starts right up.
Headed to the store on the way home everything fine. Go to leave the store turned over and started then stopped immediately. Then would not start. Opened hood, pulled off distributor cap and rotor. Tapped top of distributor. Put it back together started right up. Four miles down the road on the highway and it quits. Pulled over and opened hood. Gave the distributor a couple gentle bangs with a wrench on the metal distributor, got in started up and drove five miles home.

After reading through the forum I am thinking that maybe some connection inside the distributor has gotten broken on one of the circuit board connections where the coil plugs in. I have taken apart every connector under the hood and they all seem fine along with fuse connections in the main fuse box under hood.
I know the ignition switch when turned on does not always provide power to the radio and I have to wiggle the switch to get the radio to power on.

Any help on this would be appreciated. Should I replace ignition switch first since I know it is suspect or replace the whole distributor or cam sensors etc.

Thanks
Bob