HANA Alert : internal statistics server problem

Hello,

We encountered with an ALERT on HANA as following:

"Internal statistics server problem"

HANA version is SP8 and SAP Note: 2007437 is already applied on the STATISTICS PLAN CACHE Table.

Table "_SYS_STATISTICS.HOST_SQL_PLAN_CACHE"

Column Name,Type,Length,Nullable,Keypos

"ACCESSED_OBJECTS","VARCHAR","5000","YES","n/a"

But when we query the STATISTICS_LAST_CHECKS table we got the following output with a "?" on the ALERT_LAST_CHECK_RATING column.

select ALERT_ID,ALERT_DESCRIPTION,ALERT_NAME,ALERT_LAST_CHECK_RATING from _sys_statistics.STATISTICS_LAST_CHECKS

ALERT_ID,ALERT_DESCRIPTION,ALERT_NAME,ALERT_LAST_CHECK_RATING

0,"Identifies internal statistics server problem.","Internal statistics server problem",?

Have someone encounter similar issue earlier?

It would be great if you can share some inputs? I did a search and found nothing other than the SAP Note.

Thanks

Sajeev