@pfd27
May I know what do you mean by reset? Does it mean you need to reset the router to factory defaults by pressing the RESET button to restore all settings and set it up from scratch every hour? Or you need to power it off then on manually to get the connection back?
May I know when did you purchase this C1200 and do you have this issue when you first install it or this issue occurs recently? If the region version of your C1200 is US version, please try to update to the below beta firmware and monitor:
https://static.tp-link.com/2020/202001/20200103/Archer C1200(US)_V2_180307(Beta).zip
Below is the guide to update the firmware:
https://www.tp-link.com/support/faq/2139/
May it help, good day.