DJM900 audio stops for a sec after a switch on of a other device

Dear Pioneer,

I Have a DJM 900 mixer now for 3 years. It reacts to any switch in the power net. For instance a light that turns on or a smoke machine thats turned on. First it happens not very often but its getting worse. what can i do to stop those issues because its very annoying when there's a dip in the music.

Greatings Danjel.