Transmission Sensor problems of the 2007 Jeep Wrangler

This is my 7th Jeep - purchased as used with 65279 miles on it. Within a week from purchase the transmission popped out of 1st gear while starting from a dead stop. Very loud and startling and I thought it was me being not used to this vehicle. No further incidents for about a month and it happened again causing me suddenly stop when pulling into traffic and nearly getting t-boned. A few weeks later it happened again and I began to talk with other Jeep owners and found this was, and still is, an ongoing problem with Jeep Wranglers from 2007-current. Further research on my part led to finding a TSB #21-001-10 rev a dated 4-20-2010. This popping out of gear happens very sporadically and without any warning, has caused me to nearly become in an accident (t-bone or rear ended) by the sudden, almost explosive stop one makes when it happens. About a month ago this began to slowly happen more often - to the point that I got in the habit of holding the transmission in 1st gear so it would not pop out. When I had this vehicle to the dealer I bought it from for routine service, I asked the service tech. About the transmission issue and was advised that it was a known problem and should be covered under the power train warranty. This popping out began to happen as often as 3 times a day resulting in more "close calls" and, TSB in hand, I scheduled the problem to be corrected at the dealer. I have been advised that this is a $1200. 00 repair and, after the warranty payment, I will owe about $400. 00. This really is a safety issue that has been ongoing for some time and, I think merits further investigation by you folks. I see recalls for the Wrangler for things like floor mats and automatic transmission sensors which "may" cause an accident - this issue has been known for some time to the manufacturer and documented by TSB referenced above. Thank you for your time.