- When daylight saving time goes into or out of effect, KAlarm does not adjust well; most alarms will be off by one hour, and some alarms seem to completely fail to trigger or show other erratic behavior.
- KAlarm requires Akonadi. Akonadi can become misconfigured (e.g. during a distribution upgrade) so that it will not run, and this can be very difficult to fix. (It's not at all clear why KAlarm requires Akonadi, either.)