I’m actually responding to what Ansui said in his message, and confirmed what our developers have tested on their end (the items do return to their original value when taken out of the guild bank, and that there is no item being lost). I’ve no idea what suggestion you’ve made, or what thread you’re referring to.
The long term solution would have to come from the developers, when they fix this issue. As Tyrskorn mentioned in the thread that I linked in my response, we’re aware of this bug, and our developers are working on a fix.
As usual, you can find hotfixes and patch notes (for when bugs are fixed) in the News section of the site.