The same thing happened to me yesterday. TP Link customer service has sent me a mail to get it to their service center if it is under warranty period. Mine is only 45 days old.

Region : India Model : TD-W8968 Hardware Version : V1 Firmware Version : 0.6.0 0.4 v0005.0 Build 130217 Rel.62075n ISP : BSNL Hello there, I am from Guwahati, Assam. I brought TD-W8968 about 45 days...