These type of machines use a mechanical button, if there is any kind of lint or hair inside of it preventing consistent contact it can cause a problem. Best recommendation is to remove the encoder knobs and then unscrew the faceplate with a hex key, unlatch the ribbon cables, and then next unscrew the top PCB from the faceplate posts with the next size up hex key. Then using canned air (duster), blow off all the lint or hair from the top board, and with the LFO button (lifting upward from the side of the button cap) remove that button cap and blow out the mechanical button itself, even pressing on it to open and close the button as you use the air. Reassemble in reverse order. This is the ideal first thing to try.
If you aren’t comfortable to remove the face (it’s easy if you decide to do it, but if you aren’t) you could use a guitar pick or other blunt implement to pop off just the button cap with the machine still closed (again, from the side direction) using a tweezer remove any lint or hair that is visible, and then blow canned air only into that button. The risk here, is that if the air stream hits other junk inside the cover, it might blow it around and cause a problem in another different button similar to what you’re dealing with now, that’s why complete removal of the face and clearing the entire top PCB area of lint is the best approach.
If this doesn’t help, then it may be indicative of impending mechanical failure, but what you’re describing sounds more like a blocked or dirty contact rather than a broken mechanical switch.
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