Car completely shut down after radio automatically turned itself on and cd began shuffling imaginary discs. Ideas? on Mercury Montego

Average mileage: 61,910 (18,355–130,377)
1 model year affected: 2005
4 people reported this problem
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its still not running 100% it started like this the car ran awesome evening on the f.w.y. it has a full tank of gas. it dies restarted it every cylinder was missing valves were clacking sounded like its life was over I did the OB tester and got P1509/P1298 /P0113/P0118 I replaced egr cleaned throddl body changed plugs the old ones were in great condition and replaced a O2 sensor but my OB tester was just a reader no reset feature well cleared codes and it sounded a little better it died again now its my charging system had the ALT tested passed it was a bitch to get out that's where im at now
2005 Mercury Montego 18,355 mi,
I had same problem with my car mercury montego 2005, 3 weeks ago completely shut down radio began shuffling, and they did a diagnostic inspection three times, and they told me it was the alternator, so they put a new one and car start working better, but now the check engine light turn on, so i dont know what problem is..
Problem started when I turned car on and radio turned itself on and cd started shuffling - no discs. I turned off car trying to reset. Did not turn off problem. Continued for 45 seconds. Happened again when driving up hill - felt car lurch when this occurred - almost like a short circuit. Happened again in parking lot, only car seemed to "stall," however, car remained on. Last time this happened (all of these episodes occuring within one hour), car completely turned itself off. Very scary. Placed in neutral, came to stop, turned off car. Each time, car started without any difficulties. Battery one year old and checked. Not the problem. Not a clue and currently in dealership. Do not want to be taken advantage of but want problem corrected. Any input/ideas are welcome. Thank you.