browser's cache and data-Go to Settings > Apps > All on your phone, then select your web browser. Force Stop, Clear Cache, and Clear Data are now available. Note: If you're using the same browser on your PC, you should clean its history and cache and temporarily disable syncing. Restart your browser to see whether the issue has been addressed.
Remove any dubious apps from your device.-Select Settings > Apps > All from the drop-down menu. Locate and choose the app that has no name. It's normally found toward the bottom of the page. Select the Uninstall option now.
Change your online browser and run an antivirus scan on your phone.
Install a different web browser and see whether the problem still exists.
If the problem persists in another browser, run an antivirus scan on your phone.