MBP but BT problems ...
EDIT: Sorry, I didn't pick up on the few seconds thing. Probably not meaningful, my reply:
Hey, it's not on my Mac Pro, but my MBP has freezing mice problems. I've read a number of reports regarding this, though I've focused on ones that include keyboard and mouse, in which one or both will freeze.
Specifically, my older Apple BT keyboard and older Apple BT mouse will be connected to the MBP (Jul 2007), and all of a sudden both the mouse and keyboard will stop being responsive. Kernel events related to BT are logged in the system.log. My best workaround is to turn off the keyboard, wait until the disconnect bezel appears, and then reconnect the keyboard.
When I disconnect the keyboard, the mouse works again with no hassle. When I reconnect the keyboard, both work again properly.
This happened frequently on Leopard until 10.5.2, where it now happens very infrequently but has occurred.