Hello @-TE5LA- ,

Welcome to our community.

May I know the model number, firmware and hardware version of your device? Please refer to

How to find the model number of your TP-Link device 

How to find the hardware and firmware version of my TP-Link device

This type of unexpected reset is unusual and shouldn't occur under normal circumstances.

Regarding firmware updates and your settings:
It's worth noting that firmware updates are primarily for fixing software anomaly, improving performance, or adding new features. These updates typically do not affect the configuration and network settings stored in your router. After a firmware update, you should be able to log in to the router's management interface to check and confirm that all settings are still valid. So disabling automatic updates may not be the root solution if firmware wasn't the cause.

To prevent this pain in the future:
We strongly recommend using the Backup & Restore feature, which allows you to conveniently save your router configuration and quickly restore it if this ever happens again:

How to create and restore from a backup file on your TP-Link Router

Here are some suggestions that you can try:

• Make sure you and someone else didn't accidentally reset the router. There are two ways to reset the router: How to Factory Reset Your TP-Link Router
• Make sure no one else has the necessary permissions, such as logging into your router with the same account to reset it.
• Make sure there was no unexpected interruption during the firmware update process, as this could also lead to unexpected behavior.