TP-Link TL-WR902AC v3 wifi connected but no traffic

hi
i have TP-Link TL-WR902AC v3 connected to a near by router as client using 2.4G, when i run a torrent and there is sudden high traffic, it stop all the traffic but the wifi is still connected and no error appears!!. and i have to reboot it so it start again.

any idea why?