Lost Calender Data - Blackberry 8310

I am posting this is every forum I am a member of. Still looking for an answer. This has happened twice on my 6 week old 8310. I had about 20 old appointments in my calender and 10 to 15 new ones. Something happened and now they are all gone. Calender lists zero . This is not a lack of memory issue!! I have plenty of memory left. Has anyone else had this problem???

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Are you syncing this same calender with your computer?

No I do not sync at all. i use a Mac with Leopard and it's not supported (very well) to my knowledge. Whatever the curve is doing it's in the phone, not external.

OK, so far no luck at all. I called AT&T customer service and they told me that it sounded like a Blackberry issue and not an AT&T issue. Never mind that it is only 6 or 7 weeks old. So I called Blackberry and they told me that because I downloaded 3rd party software (ringtones) that I probably voided my warranty but to go back to AT&T and see what they say.
Today I went to my AT&T store where I bought the phones and 2 year contract. They checked the phone for water damage, scratches etc and found it to be pristine. I do not abuse my equipment. Trell at AT&T was a nice guy but told me to call Blackberry Warranty which is where I called already. SOOOOO from AT&T to Blackberry to AT&T back to Blackberry. AT this point I just don't know. I must say although I got no help anywhere everyone was very polite.

OK, 12-13-07 I called AT&T warranty department and found a sympathetic ear. He sent me out a replacement and even shipped it over night. How great is that? Soooooe today 12-14-07 FedEX is at the door with new (to me) phone. I swithed the sim and media card and start setting up the ringtones etc. phoe shuts off and starts rebooting. Blew it off and started entering some new contacts, phone shuts off and starts rebooting. it did this 4 times in an hour. SOOOOE i called Warranty department and there sending out another new to me phone..
Now i have read alot of problems with the Curve (8310) bout does anyone know what percentage of phones actually have a problem. Am I just the most unlucky customer or what. Love the phone but i am seriously starting to question my choice. We'll see what number 3 acts like.