Getting ghost screen or ghost touch issue with ASUS Vivo tablet

I have an Asus vivo tab that runs windows 8.1 and for the almost 2 years that I have had it it has been great. However in the past few months a problem started occurring which many vivo tab users have had. It is known as the "ghost screen/ghost touch" problem because the tablet will randomly begin acting as if one was tapping it in various places after the screen is turned on while it is asleep. It registers multiple taps which makes it hard to type and sometimes it moves programs all around. The only way I can fix it is to just wait for it to resolve the problem itself or restart the tablet. Sometimes I have to restart it manually because the side gestures do not work. Then I have a second problem that just happened after it said that my memory was full ( I had around 27 GB), HOWEVER, my media files and apps did not even take up half this space so I do not know how the rest got filled up. And the worst part was when I let the tablet sleep for a few minutes because when I turned it back on it had deleted almost all of the apps I had downloaded. To make matters worse, I could not access the settings nor any existing applications. Every time I clicked on the app or settings it began to show the opening screen and quickly closed it, no matter how many times I tapped it. I have enjoyed this product for a long time and have used it with much care and properness but despite this it has become quite faulty. I am disappointed that such a great product has turned into something of lower quality and with no apparent reason. Please is there a way to fix it? Should I send it to Asus to get it fixed or is there no way to fix it anymore?