seem the server time of your delegate node is incorrect, which cause 3 delegates missing block at last 3 rounds, please check and update your server NTP service accordingly if necessary.
He is not the only one...
I might of been one of those since late last night.. My apologies. I ran into trouble while updating to 0.4.15 as I kept running out of memory after multiple reboots and deleting/re-building the client. I ended up having to start over from a fresh VPS image. I'm still not sure what was causing the issue, isn't 2Gb the recommended memory amount??
Anyways.. I just got NTP re-installed. Thanks for reminding me.
If you have a personal computer running Ubuntu you can avoid memory problems on the VPS by compiling on the personal computer then simply copying the executable to the server. I do that every time, its also way faster!
My seednode has 512mb of ram but runs just fine with 150 connections, does use a swap of 4gb though.