Below is some of the parameters.
target-block-time = 180
pow-minimum-bits = 22
target-adjust-freq = 86400
I am mining with one node and Below is the average time per 480 blocks.
|No. Block||Average time|
As you can see, the average time to 2400 is normal,
but the average time between 2401 ~ 2880 and 3361 ~ 3840 is too fast.
I did not add nodes and did not other tasks.
Why does this happen?