Out Of Memory errors detected on your server & Call Traces found on your server

Hi hoping to get some help with these errors... For some reason I am getting and The syslog seems to be quite large and goes back over a month, dont know if I can change anything but unraid been up for 29days and I dont want to reboot it just in case I need more details. I have attached the diagnostics and hopefully I reboot should sort it but need to know if I possibly have hardware issue and need to replace the RAM. Thanks in advance

OOM errors started when the mover ran, I had a similar one recently and from what I've read they are quite common with kernels 4.8 and 4.9, apparently fixed on kernel 4.10, but unRAID is still on 4.9. Since then I decreased my RAM cache and so far no more OOM errors, you could try the same, manually or using the Tips and Tweaks plugin. Values to change are vm.dirty_background_ratio and vm.dirty_ratio, default is 10 and 20, I set mine to 1 and 2 just to see if it would hel