My son was playing on his keyboard and while he was pressing the function button, there were many random keys pressed which moved the keys. Middle C was no longer at the correct spot. Using the user manual, I was able to correct this problem by pressing the function button and transpose key. The problem is that if the piano is turned off and back on, the keys go right back to the incorrect key. I tried unplugging the key board for a couple of minutes and also using the operational lock, but the keys still change after the keyboard is turned off and on again. Please help.
