The issue of the radio resetting is a good hit. It usually means a complete electrical failure. The customer states now it takes a while to restart. Is there a crank but no start, no crank, do the power windows, blower motor, etc fail to work? Does the dash power up? These points will lead you to the issue. Could be as simple as a feed wire on the starter, a secondary wire on the back of the alternator, or a loose lug in a primary wire. I would look at the connection at the fire wall. It's unusual a ground would cause this type of failure but it's possible. If the main ground is faulty you'll need to inspect all secondary grounds. If this is an automatic look at the shift cable as well, i've seen them act as chassis grounds and melt internally. If you get lucky enough to have it fail for you the wiggle test will be a big help. I remember when it was an important part of repairing fords.
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never argue with a fool, they'll drag you down to their level and beat you with experience