We have three 3850 switches. They came with code 3.2.2 and work fine when stacked. We upgraded two of them to 3.3 and stacked them. That also worked fine. We added the third switch running 3.2.2 to the stack. It would not stack. The show ver command showed that the third switch model was model_unset. It would not stack. After a few minutes the active switch 1 reloaded. So the stack was missing switch 1 and 3. The only way to fix the issue was to unstuck all three switches, upgrade the third switch to 3.3 to match the other two, and then stack all three again. Has anyone experienced this?
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