Of all the rotten luck...
Here I was going through the final dungeon in Resonance of Fate, where I had spent 2 hours fighting off the toughtest bosses I've ever seen. But I pulled through, regardless.
Just as I was watching the cutscene before the final boss battle, but I noticed that the Xbox 360 S power supply was very far from the console and pushed it back, but apparentely the cord wasn't completely connected and the console reset itself.
I was pissed, but the good side of this, is that I managed to do roughly the same thing in an hour and kept a lot of cash I had wasted on Retrys.
I saved just before the final battle. Tomorrow it is...