Phone contacts partially missing
Help, is there a known issue with iPhone 4s and the recent IOS 7.1 update that would cause my contacts to reset to old data? I backup my contacts regularly and all were on my phone last night when I powered off. This morning, after powering on the phone, I noticed that my contacts appear to have reset to some arbitrary old date (roughly 1 year ago and all new contacts I've added since that date vanished. Also, text tones set have reset to default, even for the contacts that did not disappear. Is this an iCloud sync issue? Any one have a suggested fix?
iPhone 4S, iOS 7.1, Had all contacts last night