SET_DBROOT_STATUS: DBroot not valid error being reported

Customer reporting error log

Jan 10 12:20:54 nvm002315 ProcessMonitor[27772]: 54.832372 |0|0|0| E 18 CAL0000:
statusControl: SET_DBROOT_STATUS: DBroot not valid: 3
Jan 10 12:20:59 nvm002315 ProcessMonitor[27772]: 59.785275 |0|0|0| E 18 CAL0000:
statusControl: SET_DBROOT_STATUS: DBroot not valid: 4

mcsadmin> getStorageconfig
getstorageconfig Tue Jan 22 07:43:42 2019

System Storage Configuration

Performance Module (DBRoot) Storage Type = external
System Assigned DBRoot Count = 4
DBRoot IDs assigned to 'pm1' = 1
DBRoot IDs assigned to 'pm2' = 2
DBRoot IDs assigned to 'pm3' = 3
DBRoot IDs assigned to 'pm4' = 4

getStorageconfig not so good

Component Status Last Status Change
------------ -------------------------- ------------------------
DBRoot #1 ACTIVE Wed Jan 30 12:20:36 2019
DBRoot #2 ACTIVE Wed Jan 30 12:20:46 2019

Couldnt reproduce issue

1. tried starting with 2 dbroots and adding 2, didnt see the problem.
2. took customer Columnstore.xml and placed oan exact system inhouse, didnt see the problem.

customer reports they have rebooted and problem doesnt go ahead.