Man, what a string of bad luck. Of course I had a simiar experience with Pioneer. I don't remember the mode, but after 8 mo's or so, I started getting weird popping noises out of the sub output. I then replaced it with another of the exact same model and it had heat issues (scrambled display, no response to controls, sound would cut out after a time). So i went with a Yamaha 5540. It had great sound; very clean and articulate, but it was under powered, so now I'm the proud owner of a 5590. I've owned a total of three Yamaha amps (well, 2 avr's and one amp), and (knock on wood) haven't had any problems.
It's hard for me to recomend an amp for your Klipsch speakers as I'm not a fan their sound. Sorry.