This intermittent reachability issue could be due to the unavailability of the Meraki API endpoint. You can ignore these alerts, as this isn't critical or related to the status of your actual devices.
Currently, there is no option to discern why the Meraki Organization monitor is down. We are working on an update where you can set a threshold to reduce the severity of alerts or skip it altogether when the Meraki Organization API is not reachable.
Till then, you can configure your preferences in Meraki Organization monitor's Notification Profile and opt to receive alerts if the monitor is down after two or more consecutive polls.
Note: We recommend adding a new notification profile instead of editing an existing one. Editing a notification profile will apply the changes to all the monitors using the same profile.
To add a new notification profile:
1. Log in to Site24x7.
2. Navigate to Admin> Configuration Profiles> Notification Profile.
3. Under the Notification Delay section, select an option to delay the notification after a few failures instead of receiving immediate alerts.
Hope this helps. Do let us know if you wish to add any other features. If feasible, we'll include it in our future releases.
Feel free to add your feedback as comments below.