Hey guys first post here , I recently picked up a d7100 about a week ago and I noticed that after i shoot for a bit and the camera is in the on position the memory card blinks on for a few seconds and back off , over and over if i turn the camera off and back on it goes right back to doing it all over again , however if i leave it off for a little while and turn it back on it takes a little while to start doing it , seems to be draining the battery quite a bit as well as the other day i was only able to take around 120 shots and the meter was on the last bar , that was shooting to 2 cards raw + jpeg , ive tried formatting the cards and stuff and nothing seems to work... does the light supposed to flash like its in standby or something? i came from a d3100 and it did not do this but being a diff camera im not sure if something is wrong or what is going on.. ive searched and had no luck finding any information on such a problem. using 2 pny 16gb cards class 10... thanks