i have an issue with SG300-28MP that connected to Cisco Aironet 1702i for 20 units
the AP going down randomly 2-4 units very often (not joining WLC)
status LINK/ACT LED is down but PoE LED is up.
the poe power consumption is about 50-60%
i used to replace the switch with New SG350-28MP the same problem happen. But replace the switch with Cisco 2960X POE and no problem at all