Amplifier problems

I've got a Yamaha amp for my home theatre setup. It's old, but have served me well since I bought it in 2003.

Lately though, it's been giving me problems. When I'm watching a movie, and there's a spike in the audio track, like a gunshot interrupting a dialogue for instance, the amplifier just shuts off and I have to turn it on again.

It's mostly when I'm watching DTS tracks on my Blu-ray. Having the subwoofer turned off and turning the amp's night setting on helps a little. Regular DD tracks are a little better than DD+ or DTS-HD/MA. Turning the volume down helps too. But a lot of Blu-rays don't have DD, and it's gotten to the point where I almost need to use subtitles to follow the dialogue sometimes because the volume is too low.

I've been meaning to replace the thing anyway, but at the moment I don't have money to pay my rent and food, so upgrading my home theatre is out of the question.

Anyone know what the problem could be? A blown fuse maybe?
 
Sounds like transients are tripping your amps thermal cut-off/breaker. Are your speaker's impedance matched to your amp? And hooked up correctly?
 
Sounds like transients are tripping your amps thermal cut-off/breaker. Are your speaker's impedance matched to your amp? And hooked up correctly?
It's hooked up the way it's always been for the past 9 years. Same speakers and everything. It's never given me this problem before though...
 
Open it up and clean out the heatsinks, make sure that fan (if any) is still working, but other than that I got nothing.
 
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