Run 1 Example 1 (first 32 characters): {"SummaryTracker":null,"Column1

Run 2 Example 2 (first 32 characters): ¢ €ªªªêÿteÐ(È„´47ó ¯*·:˜y@X

CustomRules.js

if (oSession.uriContains("/yadayada?Id=")) 
{
var qs = oSession.fullUrl.ToString;
var qsT = oSession.fullUrl.Split("=");
var qsone = qsT[1] + "_ABC";
oSession.SaveResponseBody("C:\\temp\\" + qsone + ".json");
}

Using latest Chrome as browser. Running fine for many months until 1 November 2019, Boom! Can anyone tell me what is going on? It appears to be random.

Thanks!