Have you change wireless settings like channel? That may help.

https://www.tp-link.com/us/faq-2292.html

Is firmware the latest?

BTW, do you have any google home device connected to the router?

To get a solution quicky, I suggest you contact tplink support directly.

Hello.

I can confirm the issues Flavio reported.

Except WiFI drops, router can reboot itself without visible reason. The boot time is very long - more then 2 minutes, comparing with 20-30 seconds of the old models.
All this issues raised many times here and at other TPLink related forums, without any reaction from TPLink support.

I have the latest firmware available on the company web site, which is more then one year old and seems no real solution exists.

Some people tried beta (Archer C1200 (EU)_V2_180308(beta)), not available to download anymore, but without any luck.

I own two other very old routers ASUS N16 and TPLink WR740N running for months(till AC cut-off) without any troubles.

The only reason to buy this new router was Internet connection from my ISP, switched to fiber optics (300Mb connection speed).

Another pity is that because of the Broadcom policy there is no option to ever get OpenWrt support for this device.

This is really disappointing!

Hi,

Send email to tplink or call them. 

https://www.tp-link.com/en/support-contact.html#Hotline-Support

Seems mail from the customers are totally ignored by TPLink. Only got formal confirmation mail from robot.

Only premium rate number provided by TPLink for Spain.

This issues are known for the long time and no solution exists or anounced, so I don't expect to get any real technical support by phone.

The only action they can suggest - to check the cables and reboot the router again, which is rebooted itself randomly. So just waste of money and time.

The real solution is to replace the router with some other model, and not from TPLink anymore.