Engine dies, but turn the key off and back on it fires right back up

Stock’ish 69 318. Converted to mopar style electronic ignition couple years back. Summit racing brand. Ballast resistor still in place. Engine been running fine for a couple thousand miles on the electronic setup. It just started in the last day, to die driving down the road. I turn the key off then hit start it starts right back up and runs for remainder of the drive. Done it a couple times now.

Figured the ecu is going out? But not seen one “reset” and work fine.

Second question is it worth the extra couple hundred bucks to go to a MSD box or just buy a summit brand orange ecu? in a stock’ish 318?

thanks for any help!