If you know who it is, report it to a mod. Maybe they will go into steath mode and track him for a while to make sure they got the right one. Freezing on home has become a " cottage industry" . Some do it because they can, some, believe it or not( I heard of a plan going down once) are actually" hits", paid for with psn cards or items from one of the gift machines against certain clubs. I am sure sony has people that can look into this.
Thanks Asuka424 for the Signature