a) In most of the cases, it happens because of the Mobile phone. Ask customer to disconnect and connect the device with Mobile phone or restart the Mobile phone

b) For the offline videos, it can happen because of the video quality

c) For the online videos, this can happen because of the streaming quality or internet speed

d) For the gaming- there is always a recommended latency value with some specific products (not with all the products), and this might vary product to product. There are chances of the latency but it will be within the given range by the brand

e) For online gaming, it can be there because of the streaming quality or Mobile phone compatibility with that particular game.