Try with higher timeout and don't request immediate return.

ATxCommon/SystemChecks.cs

@@ -42,7 +42,8 @@ namespace ATxCommon
                 Log.Trace("Querying WMI for CPU load...");
                 var searcher = new ManagementObjectSearcher("select * from Win32_PerfFormattedData_PerfOS_Processor");
                 var opts = new EnumerationOptions {
-                    Timeout = new TimeSpan(0, 0, 2)
+                    Timeout = new TimeSpan(0, 0, 10),
+                    ReturnImmediately = false,
                 };
                 searcher.Options = opts;
                 Int32 usageInt32 = -1;