Error initializing Rooms and Resources Manager. Rooms and Resources Manager shutting down.: RnRMgr: Error switching cluster busy time database

For the past 2 months, I have been experiencing errors with RNRMgr task once in a while.

Each week we run maintenance with Domino down on key databases. Part of the maintenance, clubusy.nsf is deleted & Domino re-started. The cluster has 2 members & the maintenance occurs on different days.

I made sure that “Sched” is the first task on the “ServerTasks=” line and that “RnRMgr” is the last task started.

“ServerTasks=Sched,Router,Replica,Update,Amgr,AdminP,CalConn,Event,Stats,CLREPL,CLDBDIR,HTTP,RnRMgr”

Still I get the following error on server startup of the first server (admin server for RNR DB)

Error initializing Rooms and Resources Manager. Rooms and Resources Manager shutting down.: RnRMgr: Error switching cluster busy time database

Moreover, the second server in the cluster, which also host the RnR DB does not seem to take over reservation when RnRMgr does not run on the first server.

Anyone experience such issues ? If so, what would be the correct fix ?