Hi @Pei. It could be due to cold weather if there is a lot of condensation or even dirt or debris obstructing the lens, so I'd recommend wiping it clean with a dry washcloth first to see if that helps. If not, you'll want to make sure the [RSSI](https://community.ring.com/t/how-it-works-your-ring-device-rssi-good-vs-poor/229#M4) on your Camera indicates a stable connection, otherwise it could impact the video quality and even cause a blurry video. If this concern continues to persist, please give our support team a call at one of the numbers available [here](https://support.ring.com/hc/en-us/articles/213608406) so they can look into this further and help find a solution. If you are outside of the US, please visit [here ](https://support.ring.com/hc/en-gb/articles/213608406)to see how to contact support. :)