i've had my bold for a year now! happy birthday bold :D and now i have to just replace the trackball..
i think you just need to update your device. my friends have had their curves for 2 years too, and they're still in surprisingly good condition. i guess you could have abused your curve which is why it's gone cuckoo on you. take good care of it, and you'll be rewarded with good service.
did that sound shady? oops.