anti-theft intermittent defect

I have a 1999 Ford Escort SE S/W and the anti-theft system activates needlessly by itself. Any guidance in solving my problem would be
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.