Europe's integrated power grids can very rarely cause weird problems. A couple of years ago, a dispute between Serbia and Kosovo left some power demand unfulfilled, which lead to the grid frequency slightly dropping, which caused grid-powered clocks to lose about 6 minutes: https://arstechnica.com/tech-policy/2018/04/european-grid-di...
Political tension between Serbia and Kosovo is not entirely unexpected of course, but it's weird if that starts affecting clocks half a continent away.
Political tension between Serbia and Kosovo is not entirely unexpected of course, but it's weird if that starts affecting clocks half a continent away.