That is not how the unit should work, so I'd say that it is almost definitely a defective unit, Doug. The signal should self-cancel after a predetermined number of flashes , which you should have programmed in to the unit when it was installed. Of course, when you are stopped with your brakes on, say at a light or a stop sign, the predetermined number of flashes and ensuing signal cancellation do not commence until the brake(s) is/are released. If you didn't program it properly, no problem, it's a simple fix. Otherwise, I'd that you call or email Kisan and tell them about this problem!