So we are building this website that basically allows customers to draw wardrobes(dragging and dropping). The clients wanted an image to be generated as well. So we used a screenshot plugin that basically extracts html and css of the drawing and generates a file. As the wardrobe gets complex(more html), it takes some time to save. So if the internet speed is slow, there are chances of failure.
Just last week they kept complaining that it keeps getting stuck, so we checked the problem multiple times to find that it worked fine and got a max time of 15s to save. So we had a video call with them.. Well they were frozen the entire time with 'trying to connect' issues! Now we know the cause after spending hours reproducing the issue. So the client kept telling us that our internet is fine. So she casts her screen switching preloaded tabs in her browser, claiming ''see, my internet is fine''