I get this bug frequently when I start up my computer. It writes plus signs continually in any blank space – for example, in a notepad file – and can only be stopped by closing the file. This prevents me from using my computer, since I can’t do anything without this bug writing all over my files. The only thing to do then is Restart – which may or may not correct the problem.
This bug is extremely annoying, as I live in the US Virgin Islands, and we get frequent power outages. After every outage, I must restart my computer, only to get this bug. One time, I had to restart my computer 14 times before it solved itself.
I am using Windows version 1803.