I'm not using any software serial, just a hardware. And I'm using a non-modified example from the library pack (well, I changed the 64 bit address).
I put it in wrong wording, I apologize. I meant serial communication on arduino side of the table, it might as well be a damaged digole board (however why would it pass 34 packets and stop I have no idea).
Plus, that xbee responds to messages sent via network.