DPM Backup Issue – Replica Inconsistent

Hi,

We are using Microsoft SCDPM and everything was working fine until recently. We suddenly started receiving the error “replica is inconsistent.” There were no VM migrations and no configuration changes. Running a consistency check does not fix the problem. The only way we can make it work is to remove the machine from the protection group, select the option to delete the existing data, and then re-add it. This means we lose all previous backups. After four to six days the same issue comes back again, affecting random VMs and not always the same ones.
Is there any other way to resolve this without losing backup history? Where can I look at the logs to understand the root cause? Is there still any way to get Microsoft support for DPM?