Try looking at the settings of your application. Maybe you are just experiencing a malfunction, so an update will be sufficient. If that's not enough, uninstall the application and download it again. Even if it doesn't work, you can find an alternative which is more comfortable and reliable. For example, I try to use a blank calendar for my work and then fill it out myself. This way, I have a better chance that I will be able to remember something, and no file will be lost. Calendars that remind you of important events are very convenient when living in a big metropolis.
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