For what reasons can not fire the submit form in IE9?

A form
<form name="searchForm" id="search_f" ng-submit="submitSearchForm()" novalidate data-ng-controller="searchFormCtrl">
 <button ng-disabled="!lastNameValidate() || !snilsValidation() || !existSelectedSources() || !dateFormatValidation()" type="submit" class="btn btn-primary btn-md" title="search input">

And like all good works, but in IE9 the submit sometimes doesn't work. What could be the problem? Who can faced the similar.
July 9th 19 at 10:10

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