Chuwi UBook Pro 8100y Touch screen often not registering touch

Hello… i have a very good Ubook Pro 8100y with almost perfect experience untill i found that when im using the touchscreen sometimes it is not registering touch in random area, the location is changing over time in random sequence. Sometimes there and sometimes it back to normal and then suddenly appeared in other area. Ok so this problem is very annoying to have. And any help and advice is welcome. Ps : sorry for my english and grammar im from indonesia . Thanks in advance