Error on memory card slot
 

Hi, last week my NX5 started showing an error message every time I put the memory stick on the slot A, code C:13:01, and says "reinsert memory card". I tried the slot again with an SD card and it worked fine (format, record, read). Today I was testing the camera again and now the slot A doesn't work not even with a SD card, it only says "reinsert card", no error code. My question is, does anyone had this issue before? how much did it cost you to replace the memory card block? (because I'm kinda sure that's the problem) or could be a much more serious problem?.