Those in Europe sporting the HTC One (M8) should soon see a notification on their phone, relating to an update being sent out to do some housekeeping. The changelog shows that the update makes the radio more stable, the camera more stable, the FM Radio more stable, and adds stability to the Video Highlights feature on the phone. You will also see an update to the weather app dealing with the barometer.
After downloading and installing this 66MB update, European HTC One (M8) users should begin to feel a little more stable themselves. The new firmware version after the update is 1.54.401.10.