If you’re having issues with Redis crashing, check the logs (/var/log/redis/redis-server.log) because you might find helpful notes like ...
# WARNING overcommit_memory is set to 0! Background save may fail under low memory # condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf # and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to # take effect.
Doing what it suggested fixed my issue.