We've noticed a recent uptick in the number of 8821 and 7925 wireless phones dropping calls. 8821's are on firmware sip8821.11-0-5SR2-2. We recently upgraded WLC's to code 8.5.161.0 At first glance it seems there could be a roaming issue as WLC logs show that phones have Roam Reasons of "New Associations Detected" more often than is expected. New Associations sometimes within seconds. Anyone experience this issue?