When accelerating, the jeep makes a grinding sound and halts.

What is your question?

The problem is sporadic. It feels like I suddenly braked and then released the pedal, but my foot is only on the gas pedal.

What makes this problem better or worse?

It’s random problem. It’s been at the shop for two weeks and the mechanics haven’t experienced the problem.

How long has your 2009 Jeep Wrangler had this problem?

I had my transmission changed in November. It helped. The problem started again, once in February and then on March 19.