HTC Desire Z :: Duplicating Contacts Itself?

My HTC Desire Z has duplicated every contact in my phone x5 - the only problem is that when I try to delete the duplicates it deletes every copy of that contact. I had to manually delete all the contacts and re-enter them 1 by 1. i turned my phone off last night and when I turned it on again this morning it had duplicated each contact by 3! Also my husband has the same phone, he isnt having this problem but is having problems having no service or signal - sometimes for hours of end when my phone right next to his is fine?