mendelson AS4 service Server is shutting down

Hi all

on the server where the java as4 service is running, we notice that the service drops after a few minutes without a specific error.
Once the service is restarted, we notice slowdowns until the service itself is down.
Below message warning on as4 startup:

WARNING: The system detected only 2 CPU core(s) assigned to the mendelson AS4 server process. With this few number of CPU cores the processing speed will be really slow and some functions may not work properly. Please assign at least 4 CPU cores the the AS2 server process.

what could this be due to ? machine resources side ?

Thanks and Regards