Hi I am new here so pls bear with me, I purchased my cag about 3 months ago, his name is Dusty and he is 11 months old, when I first got him home he was perfect, he stepped up on demand, let me cuddle him in my arms, scratch his head ect, but about 3 weeks ago he started biting and he has just got worse, he will no longer step up or let me stroke or scratch his head, all he does is bite me (hard) I don't tend to let him out as much any more because it can take me ages to get him back into his cage and I also don't want to get bit!!!! He will let me scratch his head through the bars but that is all. I would really like the old Dusty back, I don't know what I have done wrong or how to put it right. Thank you