I've been getting these issues every night for the past week or so now.
When it starts and i try to log into Gmail or Hotmail i get a notification of possible fraudulent activity as it thinks i'm in a different location.
I'm from Glasgow. When I check my location it always shows as Glasgow. When these issues start happening my location shows as Sunderland.
You can see from the graph it's about to start going haywire again.