Vinod on Is Thingspeak tracking the device IP address?

This is a common situation where code on the Arduino is writing each field individually, instead of setting each field and writing all fields in a single shot. Take a look at this example to see how to write multiple fields in a single shot:

https://github.com/mathworks/thingspeak-arduino/blob/master/examples/WriteMultipleVoltages/WriteMultipleVoltages.ino