I don't believe anyone can help you with that. That's the unit crashing. At least, in my experience. Are you touching the screen too many times & too fast? I found that to be the case that lead to the message you received.
Try to take it slow and touch the screen, pause & let the reader react.
As far as losing your place & reverting back to the original font, that's what will happen when you get that error. It's like the processor had a hiccup and forgot what it was doing so it went back to the original file configuration.
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