Region : UnitedStates

Model : TL-WA901ND

Hardware Version : V3

Firmware Version : 3.12.6 Build 110214 Rel.33012n

ISP :

Hi
I've got an Access Point TL-WA901ND, its operation mode is set to Client and it is powered using the PoE injector and the cable length is about 15-20m (50-65ft). On the other end the ethernet cable is pluged into a router TL-WR841ND using the WAN port (to transmit only Internet from the other network to the TL-WR841ND).
Now, the AP is powered up, but sometimes it reboots automatically up to several times a hour without any reboot command or power loss. But this doesn't happen all day, one day its more, one day less, in the morning it is usually less than in the evening and so on.
I've realized also that sometimes somehow the Internet Access (to the other Network) through that AP breaks. It resotres itself only when I click 'Survey" in the Wireless Settings of the AP or reboot it.
Does someone know where this behavior comes from and what to do to get the AP working well?
Thanks