The error message means that one of the stack connections is flapping,going up-down constantly.
According with the messages, the connection we are having problems with is the one between switch 1 stacking port 1 and switch 2 stacking port 2. This error message could be caused by a faulty stacking cable or a faulty stacking oort. If possible, I would like you to remove the stacking cable connected on these ports and then clear the log and verify if the message stops. Then, if you had a spare stacking cable,it would be a good idea to try it out.
If you do not have a spare cable, in order to determine if the problem is with the cable or the a stacking port it self, we would need to swap the stacking cables around, and if the error message now points to the other two ports, it would be definitively a problem with the stacking port itself.
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