You need to give more detail such as what device you are using, what you are doing when this happens etc etc
It only happens on my HP desktop. Happens everytime I log into BT and has been happening for a long time.
I don't get this problem on my tablet or phone.
What do you mean " when I log into BT"?
Is it when you try to log onto your BT email, or MyBT to see your bills etc.
I have moved you onto the email board.
If you have a look through the board you will see others with a similar problem.
You could try clearing the cache, history and cookies from your browser and if you have the "stay logged on " box ticked you should untick it.
You could also try this link