Please make sure to properly configure memory allowance of Unimus Core:
Configuring memory usage

RAM requirement is for the Unimus Core service only.
You have to have the required amount of RAM for the OS and other services on the system.

Up to 200 devices polled by Core

512 MB RAM
2-core CPU

200 - 1000 devices polled by Core

1 GB RAM
2-core CPU

1000 - 5000 devices polled by Core

2 GB RAM
4-core CPU

5000 - 10000 devices polled by Core

4 GB RAM
8-core CPU

10000+ devices polled by Core

Please contact us to properly specify the environment needs for your deployment.