@ eirol_99, xelly
i think a part on the amp section.
i noticed that when you load it with too much signal, it 'stops' and you just have to re-switch it. but if a lot of dj's are doing their own show almost every night and you cannot supervise the way they do their mixes, the amp will give in. after the repair, i installed a stereo compressor limiter before the amp. it works flawlessly now according to the dj's.