There has been a problem with crafting guns that take more than 20 minutes to complete on my account. One gun in specific is the ADR-97. Whenever I craft this gun and this has been a problem since I reached level 13, the weapon starts to craft, but then when I close the Vigor game app for more than ten minutes the weapon disappears as if I haven't done anything and all the materials used in the crafting process leave also. This is a fundamental but very serious bug or glich that needs urgent attention.