I'm going to use this format, to make things a bit more easy.

Date/Time: 6.4.2011/22.20 CET

Description: When I call for backup in a shotout or something, the backup arrives. But when I turn around, away from the cops and look back, they disappear (de-spawn). I don't know what to do, but my guess is, that the game puts them away or it's the mod. Sometimes it lets me have like 2 cops, but they get killed most of the time by an RPG, wich leaves you alone. (I am playing in hardcore mod).

Problem: Bots disappear when on foot.

How to recreate it: Call for backup in a shotout or something, wait for the cops to exit the vehicle, look somewhere else and look back. They will be gone.

From what I've heard, that's an old bug with LCPDFR. I don't think much can be done about it at the moment.