Sony has issued a mass mandatory password reset on the European PlayStation Network, despite there being no security compromise.
European PSN users reported numerous sign in issues late last nighttime and were told that the issue was due to irregular activity.
"We monitor PSN account for any irregular activity. If such activity is detected we will sometimes reset passwords," a support team member said. "This was done purely as precautionary measure and there was no specific evidence that any accounts had been compromised."
The Sony employed later added that "there is nothing specific to worry about” and said "only a small number of users" had been affected.
I had to reset my password as I was unable to access PSN, so if you are having the same issue it's worth checking.