I think you'll find that most everything is unresponsive immediately after rebooting your tablet. IT OS 2007 runs a bunch of things on boot in the background that take a lot of CPU. If your CPU is too high, everything will be unresponsive, but Kagu will suffer more than most apps because it's GUI is very CPU dependent (in short bursts - not long term - no need to worry about battery life).

Sometimes these tablets need to be rebooted too. They get into strange states sometimes. I don't *think* this has anything to do with Kagu. Probably a hardware/OS bug(s).

In conclusion: if it's working now, don't sweat it.