Thanks @netfin for your reply.
It suddenly started to work again… without to do anything else!
I´ve already configured a time server in my NAS but, maybe (as you wrote) was not syncronized well having the time phased out to raise this problem?
Not sure because, to be honest I don´t know which file open (between all logs files collected in the .zip attached) to take a look about that. I had some time ago also problems related with the time. Look here.
At least in the log of the NAS it doesn´t says anything about time… but who knows?
I´ll keep eyes open if happens the same the next time.
