Ceph OSD reported Slow operations

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In a production setup of  36 OSDs( SAS disks) totalling 180 TB allocated to a single Ceph Cluster with 3 monitors and 3 managers. There were 830 volumes and VMs created in Openstack with Ceph as a backend. On Sep 21, users reported slowness in accessing the VMs. 
Analysing the logs lead us to problem with SAS , Network congestion and Ceph configuration( as all default values were used). We updated the Network from 1Gbps to 10Gbps for public and cluster networking. There was no change. 
The ceph benchmark performance showed that 28 OSDs out of 36 OSDs reported very low IOPS of 30 to 50 while the remaining showed 300+ IOPS. 
We gradually started reducing the load on the ceph cluster  and now the volumes count is 650. Now the slow operations has gradually reduced but I am aware that this is not the solution.
Ceph configuration is updated with increasing the
osd_journal_size to 10 GB,
osd_max_backfills = 1
osd_recovery_max_active = 1
osd_recovery_op_priority = 1

After one month, now we faced another issue with Mgr daemon stopped in all 3 quorums and 16 OSDs went down. From the ceph-mon,ceph-mgr.log could not get the reason. Please guide me as its a production setup
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