I have a Bose Lifestyle 30 system that was bought 8 years ago and I have some problems started just few weeks ago. The system sound shut off intermittently after I turned the power on. I have to turn the power off wait for few minutes, and return it on to get sound back. But the sound shut off was not consistent, it could had no problem for a whole night or it kept shut off every other few minutes in the first 3 hours and later it was fine. If I kept the power on after the sound was off, sometimes it could have a sudden loud sound came out like thunderclaps, not music though. Couldn't figure it out what is wrong, and only changed power surge protector, any help would be greatly appreciated.