Hello @Brutas 

Thank you for reaching out to us and welcome to the TP-Link community.

In order to get clarity and to assist you accordingly, please reply with the answers to the questions below:

1. Do you mean both the 2.4G and 5G Wi-Fi LED will be off after working for some time? Please login to the router web GUI to check if the Wireless Schedule is enabled or not. If that is enabled, try disabling it to monitor the connectivity again. This is the guide to configuring the Wireless Schedule on the AX10.

2. If the above has been confirmed and the issue persists, please try resetting the AX10 to factory defaults and reconfiguring it from scratch, just set up the internet on it without modifying any advanced or wireless settings, and monitor the wireless connectivity for one day or two. If the issue doesn't appear, try to modify the settings one by one as requested to observe.

3. Please verify if the issue happens when you just install the AX10 or if it happens after working for some time after something special happens, such as a storm, power outage, or firmware update?

If none of the above helps resolve the issue, it's suggested to reach out to the local tech support, so they can work with you in looking into the issue further or help with the replacement:
https://www.tp-link.com/support/contact-technical-support/#Hotline-Support