strange bug m4l + bufgranul~

a very strange bug appears in my pc when i put two bufgranul~ (GMU externals) simutaneously at diffrent tracks…
the trigger of the bufgranul~ stucks and triggered automatically very rapidly even if i stop or disconect metro object.. and after that every device with bufgranul~ i put in a track, has the same problem..
this problem does not stop until i quit and reopen ableton – yap so tragic!
(as a result i hear a distorted high pitched sound because of many grains simutaneously)..

this problem does not exists if you have bufgranuls~ at the same track!

i m wondering if this problem appears only to my pc …

i have upload the devices for testing