RT-AC5300 Woes

Hi guys - first post! Looking for a little bit of help! I've had this AC5300 for several years and it's been great. I've just recently started having issues with it, but I'm not able to figure out what any of this stuff means. Not sure what all info you'd need, but here's the issue(s) that I'm having...

Feb 24 18:55:09 syslog: WLCEVENTD wlceventd_proc_event(458): wl1.1: Deauth_ind 50:1A:C5:01:54:58, status: 0, reason: Class 3 frame received from nonassociated station (7)
Feb 24 18:55:09...

RT-AC5300 Woes