2000 Jeep Grand Cherokee dies

So I recently bought a 4.7 liter, 2000 Jeep Grand
Cherokee Limted. But a week or so after driving it,
it started to die. I would be driving and my battery
gauge would fall to 0 as well as having all of my
other gauges going haywire, the steering wheel
would lock up and my jeep would start to slow
down as pressing on the gas pedal felt like
pressing through mud or something. This would
force me to turn off to the side of the road. After a
couple of minutes I was able to get it running
again. I went to two mechanics who both could not
find a single issue with it beside the first mechanic
replacing my crank sensor. The jeep would still
continue to die afterwords though. The only
difference between me driving it and the
mechanics driving it though was that I would be
listening to my music since it has a Bluetooth jvc
unit in it. So I turned the stereo completely off and
it would drive great. Just recently though I was
driving it and it felt like it wanted to die for a
second at 25 mph then just slightly kicked itself
back to driving normally. I honestly have to idea
what the problem is and don't know what it could
be at this point. The second mechanic also
checked my pcm saying that he could find any
issues. Any advice would be helpful, I just need to
know what going on besides having to spend
hundreds more just figure out the issue.