I wonder if it has to do with daylight savings? Looking at the source code I see the below:
Where the lblError = the Signature Verification Process Failed span id. the GetTimeZoneInfo() method seems to be the only thing calling and catching this lblError label. Since most of the issues have occurred within the last 24/48 hours, I bet there's a piece of code that wasn't updated to account for daylight savings.
</div>
<div class="err_typ">
<span id="lblError">Signature verification process failed</span>
</div>
GetTimeZoneInfo();
try {
$(document).ready(function () {
if ($("#lblError") != null && $("#lblError").innerHTML != "") {
$("#dvLoading").html($("#lblError").html());
$("#divError").hide();
}
});
} catch (e) { }