In my case it hasn't happen again.. Although I removed package zram-config from the host servers ( I think this is the only difference in software from 16.04 to 18.04 that I added. I would like to either discard or confirm that that it has an effect on the issue
In my case it hasn't happen again.. Although I removed package zram-config from the host servers ( I think this is the only difference in software from 16.04 to 18.04 that I added. I would like to either discard or confirm that that it has an effect on the issue