The most likely cause to this problem is faulty electrodes. Please try to new electrodes to see if this solves the problem.
If you still have problems, it may a due to a damaged lead wire. Try using a different lead wire on the effected channel to see if it fixes the fault.
Another cause could be the electrode losing its adhesivity to the skin. Please try replacing the electrode if this happens and clean the area your are stimulating with alcohol. |