If client task agent registration was lost then the first attempt will be performed in 1 minute. If registration fails, then the next attempt will be in 15 seconds, 30, 60, 120, 240, 300, 300, 300 … 300 seconds.
The retry attempts are a bit randomized in 1-minute interval, i.e. if it is scheduled to be in 240 seconds, then it will occur in interval 210 – 270 seconds.
This is hardcoded and no specific setting can be used to change this frequency.