Necroing this post from 4 days ago to add some more information for this account
Trade limit appeared to trigger when taking out a lot of mats from personal guild bank (transferred from main for leveling jewelcrafting).
Half of the mats could not be withdrawn, and similar transfer limits described in the OP started happening.
The account is ~20 days old
The account has a level 80 character
This is getting kind of ridiculous.