I'm having a similar problem. The MS10 causes the zone indicator on my PS561 console to light up when it sees movement (as it should), but the indicator remains lit long after movement in front of the MS10 ceases (the MS10 is in my bedroom). The only way to clear the zone indicator is to press the test button on the MS10, and I have to wait some time before doing so. The MS10's detection is set to 2 movements for a trigger.
Can anyone help?
Thanks!