HISTGRM$ has highest segment waits. Causes? Resolution?

When running the following

SELECT owner, object_name, SUM(VALUE) buffer_busy_count ,

        round(sum(value) * 100/sum(sum(value)) over(),2) pct

FROM v$segment_statistics

WHERE statistic_name IN ('gc buffer busy', 'buffer busy waits')

  AND VALUE > 0

GROUP BY owner, object_name

ORDER BY SUM(VALUE) DESC

/

The two top segments with highest waits are

OWNER

OBJECT_NAME

BUFFER_BUSY_COUNT

PCT

-------------------- --------------------                         --------------------------------                -------

SYS	HISTGRM$	32370                22.60
SYS	I_WRI$_OPTSTAT_HH_ST	15250                10.65

Have never seen this before.  Any ideas on the cause and how to resolve?