Prob with Yamaha S250 digital keyboard

[Floyd]

Hi guys..can anyone help me with my keyboard..I'm a musician and need it for gigs..it just starts changing sounds on its own as I'm pressing the piano keys..I assumed a earth fault and made sure all earth connections are secure, was ok for a while then it started doing the same thing..i did a earth check on all points nothing seems lose..maybe im missing something else..pls help

 

[kellys_eye]

Something loose/broken inside most likely.

Check connections to the keypad that selects the sounds and look also for cracks in the circuit board and dirt under the keys of the sound selection keys.