Rick, I'll be kind before one of the more irascible members retorts, "The search button is your friend." There are several threads about this problem, so read those first. Since you're not mechanically inclined I'll boil it down for you:
1. The heat and surface treatment of the original bolts causes them to become brittle with time and use and the heads break off. Not all of them, but a high percentage. Only Ford knows how many (and maybe not even them), but my guess from what I read on the Forum and discussed with members and GT specialists is it's probably in the range of 50% or more. FYI, I believe my car has the original bolts, and it has 32Kmi with no problems, so I'm going to take a close look this weekend to find out if they are original bolts. If they are I will replace them.
2. Ford issued a recall some years ago to replace them with improved parts, however not all cars were done. To find out, go to your Ford dealer, give them your VIN and ask them to search OASIS to see if the recall had been completed on your car. At this point, the recall campaign is over, so you can't go to your Ford dealer and get it fixed. You have to go with the aftermarket ARP bolt kit.
3. It's not just a problem at high speed, it's a problem at any speed, because when the bolts break or loosen up, the inner CV Joint shaft (that goes into the side plate of the transaxle) slides off the spline and lets the tranny oil pour out of the tranny on your floor and driveway. If you ever see this, STOP driving the car! If you keep going, the CV joint and half axle will back all the way out, fall on the belly cover, flop around under the transaxle, and probably damage something expensive. You also will lose drive to the wheels. So you'll have to get it towed anyway.
4. Definitely a GT Guys punch list item.
5. There are a bunch of Forum members in S. Florida, so check out the map of GT owners and make contact with them. They can help you.
6. Use the search function.