Well I see something in log
[3765] 30 Jan 11:31:10 * 1 changes in 900 seconds. Saving…
[3765] 30 Jan 11:31:10 # Can’t save in background: fork: Cannot allocate memory
To fix this redis error you need to
echo 1 > /proc/sys/vm/overcommit_memory sysctl vm.overcommit_memory=1
