Most of the time ., Some AP's are required it for Physical Hard reboot for resuming the AP services...
kindly share us your inputs for fix the issue permanently
For your easy reference..Pls find some ZD & AP tech parameters /our observation detail are as below
A) ZD firmware : 184.108.40.206 build 50
B) AP firmware : 220.127.116.11.50
C) ZD Model ; ZD5100-10
D) AP model : zf7343 And zf7321
Before Hard reboot the AP : DIR is not stable and Power LED is glowing
After hard reboot the AP : AP's are showing us connected mode in ZD (GUI)
DIR is stable at AP end.