Why my nintendo dsi frezzes up randomly

Ok so my nintendo dsi frezzes some times when i pick it up same times shuts down rndomly withaout warning also this happens when i remove that cardrage i bought the DSi in decmber 1st 2011 brand new videos explain the situetion: https://youtu.be/k9VDXsTdaC0 and https://youtu.be/c4yJVVPEL-c