Since he turns on and goes immediately back to sleep, he has a glitch that is called ‘the me sleep again glitch’. Its very common and it has something to do with their tilt sensors. If you try a hard reset (holding the reset button, and pressing your finger on the furbys tongue while he’s upside down), this usually solves the problem. But if he’s cutting off in mid-conversation, it has to do with the motor suddenly stopping (you’ll have to take it apart,and spin/lubricate the motor)
Now for him not interacting with your royal furby, is a problem. Since there sensors are based off of light, you have to keep them at 1ft or closer from one another. If you tickle one of the furbys bellys while the other is watching, it causes a light sensor to go off, so the other furby can pick it. (that’s how I get mine to talk to one another). If you can’t get them talking to each other at all try using a TV remote, the infrared sensors sometimes causes a trigger for them to start saying random phrases like “dance!”.
I’m assuming you have this model
Anyways I would really appreciate if you’d check out my animatronic problem: Why Is My Wowee Elvis contorting his face?