Getting another XV6800 replacement

The keyboard on my XV6800 has developed a defective problem yet again. Hence, I am requesting another replacement from Verizon Wireless. The last time this happened, I received a replacement which was defective.

HTC makes great devices, but what is it about the Titan keyboard that causes these issues? Spacing too tight? Dust? My next phone won't be a slider and it may not even have a hardware keyboard. I may end up with the Samsung Omnia or the BlackBerry Storm (although there are newer versions of each of these phones that will be appearing later in 2009 and in 2010).