If you load one PHP file, thatās counted as one hit.
Since your website have multiple files, such as PHP, JS, and CSS, and with these DDoS attacks resulting hundreds to thousand hits in few minutes, you can be suspended.
The built in bot protection system does a little bit to help, but if you want better DDOS protection, then get cloudflare provided it is not a subdomain.
Mine was that way. Sometimes it seems itās down just if you omit the http://www. before your URL. Try typing that and then your URL and it might work more often.