T-Mobile rolls as we speak a new software update to HTC Sensation 4G bringing Android 2.3.4 Gingerbread OS and with it an improved performance and stability.
HTC Sensation 4G will receive in stages until January 15th, 2012, a firmware upgrade to software version 1.50.531.1 which will bring the following features and improvements:
- Software stability
- Improved battery life
- Improvements to Trace dictionary
- Screen unresponsiveness resolved
- Device taking screen shots resolved
- Lock screen shifted up resolved
- Icon pixilation resolved
- Improved Wi-Fi connection
- Green lines on photo resolved
If you didnt get prompt yet to download over the air (OTA) the new update you can try pulling it manually by going into Menu> Settings> About Phone > Check updates and if this doesnt help either than you will have to wait a little longer as T-Mobile promised the update rolls in stages until January 15th when it should reach all connected HTC Sensation 4G devices on T-Mobile network.
source: T-Mobile Support Forum