Selenium Webdriver unable to click the submit button for the Second time after entering the datas from the excel

In a Pop up window we read data from the Excel for different fields.After reading the data, we click on submit button.For the first Time the data is submitted.For the second time it is unable to click on submit after taking the data from Excel.

HTML code for the Submit button:

<div class="ui-dialog-buttonpane ui-widget-content ui-helper-clearfix">
<div class="ui-dialog-buttonset">
<button class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only" type="button" role="button" aria-disabled="false">
<span class="ui-button-text">Submit</span>
</button>
<button class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only" type="button" role="button" aria-disabled="false">
<span class="ui-button-text">Close</span>
</button>
</div>
</div>

Selenium Code for submit button using For Loop:

wait.Until((d) => { return d.FindElement(By.XPath("//html/body/div[4]/div[11]")); });
driver.FindElement(By.TagName("button"));
driver.FindElement(By.XPath(".//span[contains(text(),'Submit')]")).Click();

In a Pop up window we read data from the Excel for different fields.After reading the data, we click on submit button.For the first Time the data is submitted.For the second time it is unable to click on submit after taking the datas from Excel.