Guild Wars 2

Every time I equip my grenade kit it automatically un-equips around 6-10 minutes later. This happens both in or out of combat, even when I am standing still.
I have disabled any hotkeys that would affect changing weapons or accidentally hitting that key. I Also use a separate gamepad so I can further rearrange my keys.
I tested this on a few other engineer kits and so far only the grenades seem to be affected.
If this is some kind of error on my part, I’m sorry, but I can’t seem to find out what is causing it. If it is intentional to stow it automatically, please change it!

This used to be the case with the old grenade kit and they fixed it a few months ago. I can attest that the bug is back.