This is caused by a new feature that makes it so you can encounter previously escaped suspects.
If you you want to disable it go into your lspdfr.ini, inside the lspd folder, you can add the following lines to change the previous suspect encounters.
(Don't include he "quotation marks")
"Ambient.DisableEscapedSuspectEncounter = True" -This will disable the encounters all together
"Ambient.EscapedSuspectEncounterInterval = 45000" -This changes how often you will encounter a previous suspect in milliseconds. So the default 45000 is 45 seconds.