Hi Larry, Sounds like iCloud has been switched off on your device. This can happen when a very large app causes memory problems (like games), iOS sees all the memory problems and switches off iCloud. This happens mores on older devices due to memory constraints.
To check iCloud:
Go into the Settings app (not Settings in myCal)
Tap iCloud
Ensure Calendars is ON
Let me know if that helps!
Regards John
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