Dear Trung,
Thank you for reaching the Small Business Support Community.
If these AP's are configured in "Bridge mode" the issue may be already identified by the following caveat;
CSCts76476—The access point may periodically experience loss of
connectivity when configured in bridge mode.
Workaround: Unplug the power adaptor or PoE cable, and then plug it back in.
You may contact the Small Business Support Center to open a service request and obtain a different solution, if any, other than the power cycle suggested as "workaround" by he caveat details.
https://www.cisco.com/en/US/support/tsd_cisco_small_business_support_center_contacts.html
If this is not the case; your AP's are not set in "Bridge mode", I then suggest you to reset to factory conditions and reconfigure manually and if the problem persists, then contact the Small Business Support Center.
I hope you find this information helpful and please do not hesitate to reach me back if there is any further assistance I may help you with.
Kind regards,
Jeffrey Rodriguez S. .:|:.:|:.
Cisco Customer Support Engineer
*Please rate the Post so other will know when an answer has been found.
Jeffrey Rodriguez S. .:|:.:|:.
Cisco Customer Support Engineer
*Please rate the Post so other will know when an answer has been found.