It doesn't. It says it rebooted due to a button press every few days.
Thing is mine doesn't do that regularly either, this is from the day i put the type b on (the first reset button press was down to me)
10:12:08, 11 May. System start Button press (PowerButton)
10:11:52, 11 May. System up
21:27:25, 09 May. System start Button press (PowerButton)
21:27:03, 09 May. System up
13:37:36, 27 Apr. System start Button press (PowerButton)
13:37:20, 27 Apr. System up
13:28:49, 13 Apr. System start Button press (ResetButton)
13:28:32, 13 Apr. System up