Archer c6 v2 and weird restarting

Hi, I have a TP-LINK Archer c6 v2 router, but it restarts approximately every 15 seconds. Even when I enter TFTP recovery (because it is possible), it still restarts. I wonder if there is anything that could make this happen. previously it restarted approximately every 30 seconds. I did not modify the software except for additional packages. I also tried restoring the default firmware but it still restarts even in tftp recovery mode. I don't have any other information. Does anyone know what could be causing this? Is it bricked now?