Check your settings for Timelapse Recording (turn it OFF) it appears at the bottom of the recording settings list. I believe it's a common newbies-mistake to hit "left" instead of "MENU" to exit this list, but by doing so you set an interval (eg. 1 frame, 2 frames, ... 10min) which let's the camera take a shot (1 image) then wait "interval" before taking the 2nd shot, ...
Also, when recording look closely at the red REC dot (in top left corner) it looks like a timer when in Timelapse, but should look like a full dot when in Filming mode.
Good luck.
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