Why is the maintenance is just before reset !?!?!?

we can’t even in the evenning because of the lag and in the morning just a couple hours befor reset there is always a maintenance is this on purpose so we cant finish our dailys or weeklys on time i recently hit 960 and because of this maintenance i couldn’t finish my 3 weekly abbysal dungeons at least amazon didin’t make this game so there is nothing wrong with the game but the servers and the management is the as new world why am i suprised .