Loss of electrical power

Hi, I been having a problem with my car (base model), not to long ago I was driving to the store and I was at least going 40 mph and the car basically shut off on me, it lost all power, the stereo turned off and it turned back on didn't have that problem for awhile until now. Today the car was perfectly fine but later on I try to unlock the car with the remote and I noticed it wasn't responding and so I had to unlock the car manually with the key and I tried to turn it on and it had no power. No lights in the dash or interior were working. I jumped started the car but it quickly turned on like nothing, fast forward the car has been working perfectly fine, it turns on everything. But I would like to know what could be the problem because it has done this to me a couple times. Today was the only day I had to jump start it the other times it would be dead and randomly it would gain power and turn on. Any suggestions?