Plantronics CS70 Wireless Headset

I've had this phone for coming on two years and it has its strengths and weaknesses, many of which are tied to the Windows Mobile OS. The pullout keyboard is great, I'm able to get a pretty decent word-per-minute rating going with it. Unfortunately I had a situation a year ago where, after taking it on a somewhat cold car drive, the screen stopped responding to the stylus. I'm able to touch it with my finger and it responds, but it no longer likes the smaller point of contact that a stylus provides.