Probably just simple load lag, there's ALOT to load in shatt, especially near the pvp battlemasters(the hundreds of lazy welfare-epic assholes who queue and stand there lagging everyone to hell instead of moving away) and those in the center returning from raids via mage portal or taking the major city portals let alone the dozens of useless npcs standing at the fp and other areas doing nothing all day lol

I'm just guessing, though