There is probably a switch problem. IF these use the conductive rubber contact type switch buttons where a "pill" of conductive rubber is pressed onto a circuit board with traces, CLEAN the contact rubber AND the circuit board with 99% isoprophyl alcohol and Q tips. This type buttons feel "Rubbery and squishy" when pressed.
If the buttons have a hard tactile feel, then check for a bad button that might have broken internal parts and replace it... OFTEN you can tell by the "feel" when pressing compared to others.
In either case, disassembly and service is required.
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