Text disruption and popups

By Ginellis ·
I am having a problem: when I am typing in social media, or even enter my password at login for banking, or writing in Word, if I use the letters 'm' or 'n' the line of text splits, typing goes awry and sometimes a small drop down screen highlighting restore, close and other options appear. It seems to happen after my computer's been in use for about 15 mins, although not always - funnily enough not on this occasion!
Whoops, spoke too soon, it's back. I used the control 'C' to copy this message, then returned to typing here and it split on the letter 'n'. Then I pressed the windows key and I appear to be back to normal. Any tips please?
Also, a pop-up page for the site of the laptop brand appears behind the screen I’m working on, multiplying every time I type either ‘m’ or ‘n’.In the instance of bank login this brand home page appears when I type the letter n as part of a password. I cannot access the site to change my password so that there is no N in it! I can’t find the source of the laptop brand page that appears although some months back I googled their brand to seek some technical help. I have used Avast security scans etc nothing coming up at the level I'm using - I am an editor and writer and I’m desperate: any clues please?

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