Game Disconnect, dungeon start over

I was in the crypts smashing away when my character froze and I got disconnected. (I thought it was going to be a local game) I was able to reconnect fine, loaded up the character and I start at the beginning of the crypt! However I was able to maintain my gear, status, and XP. I just had to kill all the mobs again. I was super angry at first, I thought I lost my progress completely, but it ended up just being mob kills. I went back through getting what seemed to be the same loot from the same areas. Burnt some of my time, but really I made out on the deal. I still think it was a glitch and it did make me kinda angry.