Have had my PSR-800 for a month and tweaked the hell out of the settings. On the LED options screen, the "Latch LED" option what does that do? Very curious about it.
Latch LED: When set to 'On', the Alert LED will remain in the LED Mode after the transmission is complete or until it is overridden by the next object that is also using an Alert LED. Default is Off.
Anytime you have a question like that, try it and see what happens. That's a quick and easy way to learn new things about your scanner and you won't hurt anything. Just keep a working copy of your settings on another microSD card.