Owners/service Manual problems of the 2004 Cadillac CTS

I was travelling at night on I-95 in florida at 70mph w/cruise control engaged. Vehicle suddenly fell out of 6th gear and engine over-revved to red-line causing engine to shut off completely (as it is designed to do) - resulting in sudden loss of vehicle speed, total loss of power steering and power brakes. I managed to guide vehicle safely to shoulder of road (only because traffic was light). I collected my thoughts and got vehicle re-started as normal. I continued on my trip but without using cruise control. Vehicle fell out of 6th gear several more times (and a countless number of times since the original incident), but I was able to prevent engine over-rev & shut-down by not using the cruise control feature. There is a transmission issue with this vehicle (see numerous internet complaints) and, given circumstances described above, I feel there should have been a safety recall on this vehicle a long time ago. Vehicle is equipped with a tremec t-56 manual transmission. Since first incident, I have taken vehicle to Cadillac dealerships. Some repairs were made, but none have solved the problem. Have also taken vehicle to authorized tremec service dealer - more repairs made. Problem still persists. Have scheduled another service repair visit to tremec dealer. Vehicle currently has 99,000 miles on it. Since vehicle is out of warranty, I have spent approximately $3,500 on this problem to date with no resolution to the problem.