@Jiri_Pilar1 if you have allowed apps linked to your google, microsoft or any social media accounts I would log in and remove them from accessing your vital data like email etc.

Also double check the admin password for the router is not a well known default. you can also turn off the admin access on remote so it can only be accessed from the local network.

If all that doesn't work then someone knows your details and has access to your accounts if all is exhausted with the router.

Hope that helps.

paul.

Hi@Jiri_Pilar1,

If you suspect your network has been compromised, it's vital to act swiftly to safeguard your data and network security. Here are the steps to take:
    1. Disconnect: Immediately disconnect the affected device from the internet or disconnect the entire network to halt unauthorized access.
    2. Change passwords: Update wireless and login passwords for all network devices with strong, unique passwords. Avoid using the same password across different platforms.
    3. Update firmware and software: Ensure all devices have the latest firmware and software updates to patch vulnerabilities.
    4. Scan for malware: Run antivirus and anti-malware scans on all devices to remove any malicious software.
    5. Access control: Consider setting up access control on your Wi-Fi router to permit only specific devices to connect.
    6. Avoid remote management: Disable the remote management feature on your router unless necessary.

If there are any error messages, please take screenshots and send here.