While playing ingame encountered bug where mob became unkillable, thus causing the danger wave to continue. Seemed partially like a visual bug since after sometime a new wave would appear but I was unable to predict when since the danger meter was at max continuously without end. Happened twice whilst researching. also noted that it happended maybe while using electric weapons maybe and with the monster that splits into smaller forms. I was able to proceed through the dungeon and it stopped after reaching a new zone/floor.