i think, thats cause from the server. i have 4 server online, but database are on spesific server with single proc. i will be move on dual proc soon, but there will be migrate from single to dual proc, i see will be have more than 4hours to upgrade all code like build the new stratum notify that connected on the new database for every coin on blocknotify. will be cause on user complaint about downtime. sorry for inconvenience

Regard,
Arief Dwi Nugroho