Slow signal strength fluctuation and up/down client link

I have completed installation and configuration system which consist WLC5508(HA),MSE and WCS (all soft are last version). APs - 1252 a/b/g/n. But have problem, some clients have a slow signal strength fluctuation and up/down client link per 1hour or 30minuts. I see that this occur, when client change AP, but I can't understand why because client are not roam, they on the one point during all time (laptop on the table for test).

Signal strength measurement is not an industry standard measurement, although dB and mw conversions are a defined standard in the aspect that 100mw is always 20dB not every client card software defines an RSSI of -67dB to be excellent.
So the validation of signal strength can vary widely in the client card software between brands and even between models, or between software releases. So there are a number of factors that play into this also keep in mind that each client cards driver software has it's own roaming behavior, that varies as widely as its depiction of the signal strength values.
Additionaly power save functions and the antenna type in the device can all affect the perceived signal strength and roaming behavior.
So the flux your seeing could be a result of the any of the following items or something else
network design: meaning possibly there is insufficent coverage and the flux you are seeing is actually multipath.
Client Card: Some client cards just don't perform well and have sub-standard components that impact performance
Driver Software: some driver software is just bad, it has poor algorithims, poor logic, etc.
Bad antenna: the antenna in the device could be of poor quality or defective.
Hope this helps...
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Slow signal strength fluctuation and up/down client link

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