The /home partition is used for many things including a temporary location for extractions, CSRs and other system files. There are processes that clean up these files automatically, but if there is a problem, disk space can get above the threshold. Disk space utilization can be seen using the 'df -h' command from the CLI and looking for the /home partition. If it is above 80%, this is cause for concern.
This could be caused by a variety of things. Although deleting files out of /home is usually not harmful, checking with technical support is always a good idea.
Check some of the culprit directories such as /home/csr/ directory. Any csr files can be deleted using the 'rm -rf' command.
Contact technical support for more guidance.