越寫越好的手寫功能？

我的電子手帳的手寫功能有一種奇怪的情況，當系統Restart後，手寫的功能會 ....

(Oh, back home now, and it's much easier to use English on my desktop instead)

... become ultra sloppy. The pen stroke will get jumpy and the recognition result can be far from poor, but after writing it for a long while, like say 15 minutes, the system will be like it's being warmed up, and started to behave pretty well.

I start to have to feeling that it's the automated speed thing that cause the problem. Just my guessing.