I have six cameras have same issue. Firmware wiped out the entire event history. Cannot re-establish.
Any thoughts???
Bill
Try uninstalling/reinstalling the app. It fixed mine. 
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Firmware update? Did you mean app update?
If the latter, when was the last time you checked? They had a problem with their servers. Got fixed about an hour ago. I suggest you test again.
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How do I revert to a previous version of the app? They removed hardware detection on Android and now it is slow and unusable. This is complete bull%%%%. They better put it back and not charge for it. I have 12 cameras and will send them back otherwise.
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After the update I have been getting a lot of false person events. Almost any movement and I get a person alert.
See this thread, there are a couple of places where the older app versions can be downloaded:
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