I’m doing this from the road, so I apologize if I miss anything…
You can adjust the presence time out (the difference between when a tag drops off the network to the platform running a SmartApp) by going to https://graph.api.smartthings.com/hub/>View Utilities>Select the new time>Update. The dropdown does not automatically update, but you can view the timeout setting by selecting Get Presence Timeout. This should reduce false positive location events, especially if they are typically 1-2 minute flip-flops.
For more cool tips, glamour shots, or just procrastinating at work… and troubleshooting, I recommend emailing support@smartthings.com.