Irule stops working suddenly?

I have a basic redirect irule like this, and we have BIG-IP 13.1.1.4 Build 0.0.4 Point Release 4.

Sometimes the iRule is just not triggered, we then remove the iRule and add it again and it starts to work again, anyone have an idea of what can cause this?

Regards,

Bunke Andersson

when HTTP_REQUEST {

    if {[HTTP::uri] equals "/" or [HTTP::uri] equals "" }{

         HTTP::redirect "https://[HTTP::host]/overview"

   } 

}