My behringer 2000 goes off and on - Behringer Pmp3000 16 Channel Audio Mixer

It is the amp module. It need to be replaced

Check out these manuals:

PMP2000 http://www.behringer.com/assets/pmp2000_p0611_m_en.pdf

PMH880S http://www.behringer.com/assets/PMH880S_P0232_M_EN.pdf

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Sounds like a few capacitors have just blown, easy fix if your handy with a soldering iorn,

http://www.behringer.com/EN/Products/PMP2000.aspx
You will find the manuals on this web page under "Documentation"

As you can see in these pics ,

http://www.avsforum.com/t/1236585/inside-pics-of-behringer-epx2000

, this is not a simple unit to troubleshoot. I need to know more about how you are using it, it needs some sort of preamp system or mixer board to drive it. Behringer stuff is also something extremely hard to find parts for, they are custom made for Behringer. Most power amps are made to be driven because the line in signal is very low for that reason. Let me know a little more info and I can help you more.

You probably need a new adapter. If not the power supply board inside might have a problem.

Return the amp under warranty immediately. This is NOT a normal thing.

That time lag would indicate a thermal problem.

Likely the power supply is a switching type that has some three terminal regulators after it such as 7805, 7815, 7915.

These have thermal protection in them and one may be shutting down.

Use circuit cooler to isolate the part that is shutting down.

Problem is likely thermal. Open unit carefully and use freeze mist (circuit cooler) to find bad component.

With that long a time period, it is possibly a component mounted on a heatsink.