Please check the following:
The “full callsign” is exactly how the callsign was received from the source, including prefixes/suffixes, if any. So if you use a “full callsign” condition, the callsign in the spot must match 100% what you entered in the trigger condition. For the “callsign” condition, any prefixes/suffixes are stripped before comparison.
Swipe left to delete spots in the app (starting from app version 1.1). Spots will also disappear automatically after 24 hours.
Try to make your triggers more specific by adding more conditions, so the alerts that you get match more precisely what you are interested in. You can also set limits on the number of alerts per time interval — either on a general basis or just for the same callsign/band/mode. However, it is more useful to reduce the amount of alerts that you get by making specific triggers, as setting low limits will just cause you to miss alerts on a seemingly random basis (whenever the limit was reached).
If you are using the HamAlert app and want to temporarily stop push notifications, you can do so conveniently within the app using the switch in the left side menu.
Nothing! I intend to make HamAlert available for free to the amateur radio community for as long as I can afford the time (and money) to keep the system running and capable of handling the number of users. While I try my best to keep the system available and performing at all times, there are obviously no guarantees.