Hello @BenForsaken,
Can you check the device administrator:
Open the Settings app on your Android device, and scroll all the way down to Security and tap on it.
Look for an option named ‘Device administrators’ or ‘All device administrators’, and tap it once.
You should now be seeing all the administrators listed with their name, as well as a short description of what those administrators do. Notice the check marks next to the names? These are the administrators that have been enabled. You can disable or enable any administrator on the list here.
Next, you can try to perform a system scan with Zemana - Zemana Mobile Antivirus - Android Apps on Google Play
Do you clear the cache of your browser and device? - You can manually do this or use CCleaner - Android Apps on Google Play
Also, I would check the router, in some cases malware may infect it and all the connected devices will get redirected to different web pages.