It looks like the diagbits for the CSAT at A2 has a value of 4, indicating poor signal lock, possibly caused by an obstruction in the path.
John checked A2 for a physical obstruction to the sonic path around 11 am and found none. When he was able improvise a zero-wind enclosure with his sweatshirt, the diagbits dropped to zero. Thus the sonic data around this time will be contaminated by John's testing.