Yes, I had changed the path but did not remember.
So, this was the problem. I have a timer which zaps&records everyday. Only... today, while watching a channel, it started the issue. As soon as the timer started, OBH began rebooting and I could nothing. I immediately understood that, at 13:30, the only reason could have caused the crash, was the timer (although, as I said, it's active since June).
I also decided to reflash with today morning backup, but nothing. As I suspected, the issue ended at 13:45, when the timer ended its program.
I also reproduced the crash with the same channel tonight.
So I tried to change channel to zap&record and, surprise, with some others it simply does not zap or record anything.