[amsat-bb] Fox high speed?

About mid-pass on the ~9:42AM pass this morning, FOX appeared to switch from the DUV mode to what I believe was high speed. The screen pattern changed from the usual 2 parallel line pattern (good eye pattern and decoding) to a multi-parallel-line pattern with brief stops. My tlm program 1.03f was set on auto. Nothing decoded; no eye pattern. I manually switched to high speed; same results. What did I do wrong?

Thanks, Ed K9EK EL98