Amplifier problem

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I've got an integrated amplifier that's been causing me problems. Every now and then I get noise from it (through the speaker) and the protection goes on sometimes (without any excess heat or speaker wire short-circuits). I found out that the problem was in the left power amplifier (removable pre-out, main-in links). The amplifier's been serviced 3 times already, because of the same problem. The last time they even replaced the whole left power amplifier.
My question is, if my self-built active crossover could cause this problem? It doesn't cause the noise itself, but is it possible that it could damage the amplifier in any way? I've always run the signal through the pre-amplifier.
 
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