Hi!
Thank you for your message! You can download CalenGoo again for free from Google Play if you use the same Google account that you used for your original purchase from Google Play. Please see here:
It seems that you have synced CalenGoo via the Android calendar. I.e. CalenGoo just displays what the Android calendar displays and it also writes all your changes immediately into that calendar. The Android calendar then performs the sync with Google Calendar. I.e. if your events disappeared without using CalenGoo ("2 hours later"), it is unlikely that this can have been caused by CalenGoo, because CalenGoo does not modify your calendar while you are not using CalenGoo (aside from moving "floating events" forward at midnight). And you also saw that the same happens when using the Google Calendar app, which shows that the problem is probably in the Android calendar, not in CalenGoo or the Google Calendar app.
The easiest way to fix it will probably be to not sync the Android calendar at all with your Google Calendar account (start the "Settings" app, open your Google account under "Accounts" and uncheck "Calendars") and sync CalenGoo directly with Google Calendar (open "Settings > Accounts" in CalenGoo, uncheck "Android" and tap "Add account > Google" to add your Google account).
Then CalenGoo will perform the sync by itself and it should work fine.
If still events vanish we can use a new log function in CalenGoo that shows what CalenGoo has done during the sync, i.e. if it has deleted an event itself or if it just has received the information from Google Calendar that the event was deleted there. When another user had a similar problem we found out this way that something else has deleted some of her events in Google Calendar and CalenGoo has just received that they were deleted and thus removed them from its own database, too. Because she couldn't find out which program or system deleted the events, she created an additional calendar in Google Calendar, copied the event from the other calendar into it and used that new calendar. As far as I know it worked fine afterward.
Please don't hesitate to contact me again if you have further questions!
Kind regards
Dominique Gunia