Ive had my DJM500 for around 9 years now and ive only ever had replaced the channel sliders. Recently the sound quality drops after a few hours and over the last couple of weeks the wait until this happens is going shorter. Ive tried alternates to my external sound card and amplifier. I doubt it will be my speakers as it happens to both (2) speakers. As it happens after a few hours i can only assume its something to do with over-heating? Unfortunately i dont have an alternate mixer to confirm it is the mixer itself but by process of elimination ive come to this conclusion. To give you as close to a specific description, its like playing a track on your iPod and then putting it under a pillow, it dubs everything. So then i have to push up the high/mid range EQ's in a 'make-shift' attempt to balance it, but it still sounds rather awful!
I wonder if anyone else has had similar issues with this model or other models from the DJM series and if they have any solutions before i have to spend a considerable amount on a new mixer?