i am have been recently having strange sound issue with my flash pinball .its the sound tone it makes for the background sound , the tone is distorted like its the wrong frequency . it begins to do this after a few minutes of being on , then a few seconds later , the sound stops completely. the sound will come back if i turn it off then back on , but the sound still stops after a few minutes.

i changed the mpu and driver board a few months ago with new ones which so i think its the sound card board or the power supply board that could be the problem since none of the caps have been changed. Already tried cleaning the connecters but no change .

yes , it worked correctly . strange how i had on a while today and it did not have that problem.
maybe connecter issue or something.