It's worth bearing this in mind in case you ever start to see this weirdness.
uk.news.yahoo.com
Cyber attackers will mostly attempt to gain control of a computer or mobile device in order to steal, for example by accessing bank accounts or taking out loans in a person’s name.
But what are the common signs that your computer or smartphone has been compromised? Some are obvious: a ransomware attack (similar to the one on M&S) will announce itself with a window demanding a ransom, usually payable in cryptocurrency.
But other signs are much more subtle, experts have told Yahoo News.
5 subtle signs your laptop or phone has been hacked
As M&S reels from a major cyberattack, it's not just major brands who should be wary of being targeted by hackers.