From the scarce information you're giving, a bridge loop seems to be created across that port. The most likely case would be that one of the wireless client has got a simultaneous, wired connection and bridges in between.
- Check the WAP log for which client associates at the time the loop is detected.
- Check your network monitoring for the kind of traffic that's looping and the participating ports.
- Consider L2 separation (different VLANs) between wired and wireless networks.
- Consider organizational or technical policies to control network bridging by users and their use of wired and wireless connections.
Also, you might want to review your STP setup.
 Your comment indicates a loop on port 16. Since both ingress and egress are on port 16, there is a loop remote to the switch. Check out which device(s) are located on that port.
Your connectivity(?) problem on port 22 may be due to the loop messing with the switch's source address table.