@Radhertz 

Welcome to the community.

First please access the Deco web UI by entering "tplinkdeco.net" in your browser. Navigate to Advanced > System > System Log, select "ALL" in the log type, and save the file to your local computer. Then follow the steps below making sure to attach the logs to the email.

I recommend sending an email to forumsupport.usa@tp-link.com with the following information:

Subject: [Forum Escalation][ID 866964] 6E login bug

Forum Nickname: [User Provided]

Thread URL: https://community.tp-link.com/us/home/forum/topic/866964?moduleId=2424

Model&Version: [User Provided]

Description: [User Provided]

Any Other Relevant Information (Logs, Config Files, Images, etc.): [User Provided]

In the template above please fill in the areas that say [User Provided].  This will open a case with our engineering team, and they will work with you via email. 

Once the email is sent you should receive an email with a TKID number please resond back to this post with that number 

Thanks. 

  @Radhertz 

Hi,
Please refer to the instructions below to check whether your client devices have configured Connection Preference settings in the Deco app to prefer connecting to a Deco.
Connection Preference on the Deco App: Set Your Signal Source
 

On the Deco app > Online Client page, if you tap a Wi-Fi device and click Signal, you can view the device's RSSI value. If your Deco app does not display the RSSI value of a client device, it is likely that this feature is not available on your Deco. Usually, this feature will be added via firmware update in the future; it's recommended to pay attention to the new firmware released for your Deco.

Btw, the hardware v3.6 = v3.0

Best Regards