You have an SR-9, which is different from mine. As Martaine2005 said, it sounds to me like your display has an issue. If it's intermittent, I'd suspect a bad connection and would reflow the solder contacts to it.
As for the set-up, I'm unclear as to how you're using it. I run my reverb through my receiver/amplifier, connecting the preamp section to the amplifier. On my receiver there are RCA jacks specifically for this purpose.
If you're connecting the reverb some other way, I will mention that mine has an internal circuit interrupt to protect itself. And if I hooked the reverb up incorrectly, the reverb cuts-out. My reverb is designed to detail a preamp signal, not act as an amplifier in and of itself.
How are you inserting the reverb into your set-up?