ive been having a little bit of a problem with my wah lately. whenever i set it into the toe down position, it often starts changing frequencys and suddenly becomes really deep and stays like that no matter what position its in. the only way i can get out of it is to do a quick slam on it and it goes back to normal, but not for long. i think it may be the bypass switch but im not sure. any know what this may be? its a dunlop slash way btw