Speakers shut off while playing keyboard

Description of problem

I bought a keyboard and attached it to my amplifier which is connected to the speaker system. After a certain time of playing, the speakers will not produce any sound anymore. The amplifier is on, and if I turn it off and restart the keyboard, everything works fine again. However, after a usually shorter time the same happens again. When play music from my pc, the speaker system works fine, even when I turn the volume way up.

Other relevant info

Keyboard: Korg SP-100Amplifier: NAD 3225PE (I know, super old)

When this issue began

Two weeks ago

Recurring issue

Yes

Cause/Steps to recreate the issue

• Might have something to do with the volume level? If I stay at low volume, it usually takes longer for it to happen.- It also seems to happen quicker if I use the keyboard pedal or forget to switch the reverb setting off.- ???

What I've tried so far to resolve the issue

• Turn everything off and on.- Playing at lower amplifier/keyboard volume.- Play without pedal/reverb.- Reconnected speaker wiring.

Submitted January 30, 2018 at 01:53AM by peppimeister http://ift.tt/2nnlhoU