Hi Luis,
was this working before or a is it a new installation. Any changes that resulted in this issue.
Is it a roaming issue or did you also get it if you just stand in front of an AP and don't move.
- please doublecheck the controller version - do you mean 9.21.05?
- what's the version on the WL3
- 2.4GHz or 5GHz, which country, which channels are used on the AP3715 and AP3825
- PSK or 802.1X
-Ron