Korg MS-20 mini VCO 2 acting funny

My beloved MS-20 mini has been having an issue when VCO 2 is set on sawtooth it will sometime garble and change octave and presumably waveform.
I’m wondering if this is an issue others have had; I’m assuming the waveform switch needs to be cleaned or replaced.
I just wanted to see if there were others out there with the same problem but with a different solution. Thanks!