Not sure what the issue is, but this has happened to me several times.
I was flying out of LAX this morning. While asking to take off one of the runways, the ATC asked me to follow instructions (see attached image)
Yes, I asked to take off two times. My bad there. However, where is my instruction? For example, if there was a WiFi dropout, does the data pushed to my device (IF on iOS in this case) just vanish? What then?.. the ATC just assumes I know what the instructions are? Is there a fix for this?