i'm having the exact same problem with my new C2600. :(

peter.gabriel wrote

Model :

Hardware Version :

Firmware Version :

ISP :

Model : C60(EU)

Hardware Version : V1

Firmware Version : 1.0.2 Build 20160811 rel.55127

Country: Brasil

When I turned on the router for the first time, the 5G connection worked for 2 hours before disconnect. Now it's not possible to enable 5G in the router settings, this message appears: The 5GHz network is unavailable due to restrictions in your region/country.
How can I enable the 5G connection again?

Hi Peter

I have the same exact issue as you, same model, firmware version and I live in Brazil too.
Have you found a way to fix this issue?

Regards

Otavio

Same issue with an AD7200, and this is recent, with no changes whatsoever to the configuration, the device disabled the 5GHZ completely by itself.
What kind of trash is this? The country is US, there is no restriction on 5ghz in the US.
I liked TP link products, now they've given me an enormous reason to not use them: Automatic, unmanned, unrequested changes to my configuration disabling features I paid for.

The 5GHz support may or may not be when it comes to consumer wireless electronics. For example, while the iPad 2 supports 5GHz, iPod touch and iPhone only support 2.4GHz.

Do you guys try reset the router to factory settings?

Better to submit a ticket to TP-Link support to check the issue. http://www.tp-link.com/us/support/contact-technical-support#E-mail-Support

yes and it didn't work.