Hey guys I need your help. This is the 2nd time this has happened. Last time this happened was probably 3-4 months ago.

Drive along the freeway minding my own business then all of a sudden it decelerates by itself. . I panic and got out the fast lane (doing about 70 and still decelerating). Dropped it in neutral and put it back in 5th and it accelerates like everything is normal. Same thing just happened tonight. Any ideas? Thanks in advance.