Step-change in page views and time spent due to daylight savings using Matomo 3.14.1

We have noticed on our instance of Matomo a step-change in the number of page views and avg. time on page reported that correlates with the daylight savings time changes here in the UK.

The time zone is set to ‘United Kingdom’ on the website and hasn’t been updated in over eighteen months. We are using the Tag Manager for firing tracking requests.

Are there any known issues or misconfiguration that could lead to this reporting anomaly?

Any help appreciated.