Keyboard and touchpad randomly stop working

I have a MacBook Pro 2015 and the trackpad and keyboard are completely unresponsive. However using an external keyboard and mouse works. This problem started around 2 weeks ago when I turned my laptop on and I couldn't move the cursor or use the keyboard, apart from the power button. Sometimes it starts working again after a couple days and then stops and starts. The force touch trackpad still 'clicks' when I press it. I have opened up the trackpad settings in system preferences and it says 'no trackpad found'. I have found that a lot of other MacBook Pro users are also suffering the same problem.