BB Torch :: Handset Losing Call Logs, Texts And Emails?

I started the contract in November 2011 with a Torch 9860.I had numerous problems with the phone freezing and randomly losing data such as texts, call logs and emails. In 9 months I've had 5 phones and 1 sim card change, 2 weeks ago BT changed the handset to a Torch 9810. The phone has worked fine till Friday when it started doing funny things like randomly receiving texts which were from old conversations. On saturday afternoon it lost all data by way of texts, call logs and emails that were over 24 hours old and in the last hour has lost everything over 6 hours old.I have all calls, texts and emails going into the messages list and have that set to save everything for ever so I can chose when to delete information.As I;m a consultant I need my call logs, texts and emails to work out my billing so this really is a pain.