Where did the movies I recorded go?

My DVR was at 67% I went in to watch one of the Christmas shows that was recorded. The DVR now showed I had 100% available and now there were only like 13 movies. I called in, the tech said she would check a code to leave the system on and let her know when the system was back up. Wa la the same 13 movies were there but where are all the others? A tech came out to my home last night, he looked at the box and at the cox equipment outside. He said the phone tech must have did a reset and that wipes out all the recordings. Well if that was done why are there still 13 titles still showing? Of the 13 titles still listed I can view only 1 of them the other 12 get error message 2.1.2.10. This is the second box I've had in the last 8 or so months. Is this normal? What do I need to do? Change out for another box? I'm getting frustrated with losing movies that I wanted to watch.