I've seen this behaviour on SG300 and SG500 units when ports are dynamically reconfigured via the auto-smartport functionality of the switch. I'm sure the same would apply to the SG200 as well. I I just disable the icon blinking on these switches and remember so save changes on my own.
The auto-smartport functionality was only meant as an example. There may well be something else that is automatically updating things. With the Sx300 and Sx500, we can go to the CLI for comparison, but this isn't an option on the Sx200. Have you gone through the various configuration pages to see if anything has changed? Also, is the switch running the latest firmware?
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