That is a good question! If it is motion detection, that could just be something triggering the motion, and would be avoidable through settings. For a button push Ring alert, or someone actually ringing your Video Doorbell, this should only be possible via a physical button press.
Check your event history to see if there is any video or event that registers, or if this is just your in home chime kit sounding. For a chime kit sounding randomly, this should not happen, but is likely due to wiring variables. Something worth checking here is your in home chime settings.
The in-home chime settings can be found in the Device Settings section, specific to each of your Ring devices in the Ring app. Most Video Doorbell models should have this setting available, but some may not. If you do have this option available, please ensure it is set for the proper chime kit you have there. Additionally, and in case you are seeing an event from the intermittent ringing, please ensure the Video Doorbell button is not jammed / stuck and is free of debris.
If this concern persists despite trying the above steps, our support team will be happy to take a closer look at what might be causing this concern. Please give our support team a call at one of the numbers available here. We’re taking additional steps to protect our team and help reduce the spread of COVID-19, so this has resulted in longer than normal wait times. If you are outside of the US, please read our response to COVID-19 here to see how to contact support.