Key Switch - notes not playing error

Error in Key Switch when I play 4 equal notes he plays only 3, 2 sometimes four notes. Deleting Key Switch the problem disappears.
Example with [GM 031] Distortion Guitar plays right and Texas Crunch guitar I get an error.

Example video:
https://www.youtube.com/watch?v=L_h9K6GurbA

Does anyone know any solution?