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My guess is some fool didn't take into account the chance you can have duplicate hours when bringing back weather for the next 24 (thus leading to, say two 1AMs) and, given how tightly ingrained Siri is to the OS, resulted in the softboot.
...Or it could be that the extra code writing needed just to cover a couple of days release of 4.1 was not worth it since it was self correcting. But we will never know and it will be soon forgotten since it is 'fixed'.
 
Not experiencing this on my S2 42mm Sport. Running the latest update. How strange.
 
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