AC500 started emitting high pitched sound at 2am

Funny how a high pitched sound is hard to pinpoint. I could hear it all through the house.
AC output was normal, 76% SOC left, but along with the sound the touch screen would not come on. No Firmware updates for anything.
I turned off the AC output and the sound stopped. Then I shut it all down/restarted and it seems to be okay. No alarms listed on the touchscreen.

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@St8kout Did you check the alarm history on the screen? Is there any error code?