No, the clients are not kicked off as part of the TxPower adjustment process, but if they are on the edge of coverage they could theoretically find themselves out of it if the SNR drops below their threshold. As such they would need to find a new AP to connect to. It is possible that is what is happening and there are issue with either your coverage and/or your roaming. I would recommend looking at both. As for the constant flux in AP TxPower, that makes me think your AP layout and coverage is not balanced. Have you had a Site Survey performed?
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