Hey guys, looks like the relay got damaged.
I replaced it for another one and so far so good.
So in fact my problem was using the relay coil as a emitter load, instead of collector load, wich as expected was giving to the coil less than 5v, making the relay not working reliably.
Even after changing the position of the coil to the collector I still was having problems with the relay.
I believe my relay got damaged because it worked without a ground wired on it (for less than one minute) wich made it oscilate very fast, making a loud noise.
The ground wire wich was connected to it was way too thin and eventually got hot and broke because i was using the relay to turn on and off my room's lamp, wich obviously stay hours ahead on.
Maybe the fact I was delivering less than 5v to the coil also helped damaging the relay.
This is only a prototype I've made to test this concept of residencial automation module that came into my imagination and now I am designing a new board, taking into account all the things I've learned(wich is lots of stuff).
Thank you all who gave an anwsare and tried to help me solving this problem, really thanks.