I got a Apple alert saying my device has 8 viruses and has 72% damage and my phone is going to lock up what do I do

Most likely it's a scam attempt. DO NOT respond nor give any personal info.

If your iphone hasn't been jailbroken, it cannot have viruses.

Perform these steps:--> Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch - Apple Support

Then Read this support article:--> Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Regards

Giulio

Would it be possible that the phone is trying to process to many things at once, some websites aren't the best when it comes to pop ups, especially ones that actually make you stop and think twice, try looking into a couple of good apps on the app store that help with browsing and un needed pop ups.