Hmmmm ... Don't want to be the bearer of bad news here ... I believe you have TWO (2) issues here. Firstly, there's a strong possibility that you are running a buggy IOS. I mean, 12.2(25)SEE??? I wouldn't touch that version with a ten-mile-pole. Secondly, there's a strong possibility that your switches have a hardware defect that affects the stacking module. Please see attachment.
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