Spells: Buffs Dropping Whilst Zoning (With Aggro/Threat?)

[Orotiagito]

I've been away from EQ for a while, but I have noticed that my buffs are dropping while I zone. For instance:

When I get too much aggro in Unrest and have to head for the zoneline, I'll lose all my high level buffs.

But..

When I get buffed before heading into Unrest from DC, I keep my buffs and don't encounter the problem.

I've had this happen when I had aggro from the griff in ECL, when I zoned out into WCL I lost my SoW and DS. I'm guessing it has to do with threat and zoning, it's really odd. Is anyone else aware of this?

Edit: I just experimented with the Dagnor's Cauldron / Unrest ZL; I threw Breeze and Shielding on and zoned in, the buffs remained, but when I zoned back out.. gone.

However, it doesn't happen every time. Not sure on the ratio of occurrence or on variables of threat/aggro.