I and people I know such as my guildmates and girlfriend keep getting our banquet house party buffs removed every time we leave tw or leave an arena match. I don't know if other people are getting it but its highly annoying and I want people to be aware.

I never noticed that but then again I noticed my buff ended quite early but had no idea why. Send ticket about it as well.

Not just that but also when you enter a guild town other buffs disappear or even change channels. It's not only the banquet buffs but the buffs you get from lovers/clerics/shaman etc. Really annoying indeed.

It might be because guild towns, arena matches, and tw are based in ch4. If buffs get removed by changing channel (do they? O.o), maybe that's why?

You not only lose them but you also can gain buffs randomly. Last time I changed channels, I gained all my Love buffs with like 15+ minute left. o__o

This also happens to me occasionally. I can't find any pattern to explain it, though.

Sometimes I lose the buff when I leave TW, sometimes when I die for the first time in TW, sometimes when I leave arena and sometimes when I change channels (which can also make me gain love buffs as lilveviruchi mentioned).