No acceleration

I started my Sonata yesterday morning started fine worked fine. Got down the road less than a mile then all of a sudden it would not accelerate, no rpm, I pressed down on the gas all the way nothing just went down to a crawl. I limped it back home at less than twenty mph. Turned off the car then restarted it it worked fine got to work on time did not think much of it cause it did not do it again all day. This morning the same exact thing happened. Any help or advice would be appreciated. Thanks! P.S. I guess I should note that I started and drove it fine several times between both incidents and this morning I got to work fine once I got home and restarted the car.