@Osjashah
Do both 2.4GHz and 5GHz lose internet? What about the wired connection?
What is the light status of the C58 when the connection drops ou?
When the network stops working, please check the IP address and default gateway with your computer connected to the modem/router separately and show me the status-details page. Instruction as below:https://www.tp-link.com/support/faq/838/
Try to log into the web UI of the Archer C58 and change the wireless settings, including the wireless network name and password.
Besides, please ensure that the firmware is up to date.
Good day.