Im pretty sure this is a virus. I've disconnected my keyboard and mouse, as well as shut down WiFi yet my keyboard will type those letters I mentioned at random, even as I type no w. Sometimes I will hear a somewhat silent beep when this is happening. I don't know what it is since I don't even download stuff on this computer.
So, to demonstrate. I am writing whatever I am writing. In the window that I am focused, if for an example there is a text box, at random things like "---{{---} {{{ ---}}{}{} -}{{{" will be typed. Even now something is interfering with me to write this. Sometimes it will go left on the text, sometimes delete, etc. But mostly it presses Alt Gr and bottom right keys. When there is no text box selected, then my mouse gets super sensitive, or pages scroll up and down really fast. As I've said, I've disconnected my keyboard, mouse and internet to see if it is a hardware issue or RAT, but it still continued on doing it. If it helps you, I'm using a Razer Blackwidow Elite and have the latest Razer Central installed, as well as Synapse (so all drivers). For the mouse, I'm using the Logitech MX Vertical. through the cable. This is on Windows 10.