I updated my router with the latest firmware released from TP-Link. I downloaded the right firmware from https://www.tp-link.com/us/support/download/archer-c9/v1/#Firmware After the firmware upgrade.

I have a separate modem and router setup. Docics 3.0 modem and a TPlink archer c9 router (loving it for the past 3 years). The wireless devices connected to tplink router looses out internet frequentl