Outdated Wordpress version is used.

Huge amount of blacklistings on that ASN/IP :
https://www.virustotal.com/en/ip-address/72.29.69.252/information/
http://urlquery.net/report.php?id=1496765409224

Vulnerable libraries used :
http://retire.insecurity.today/#!/scan/0cff229ff31495032091b447f054b065b1ff7e647b3768221384f26f171c35ff

My advise :

  • Get dedicated hosting
  • Fix the vulnerable library issues.