I tried to replicate the described issue, using the provided code snippet and implementation of the RadGrid. I have used the approach that you are subscribing for the TextChanged event of the RadAutoCompleteBox and the event is properly triggered each time the text is changed at my end. Could you be more specific, regarding how exactly to replicate the issue. Do you observe any pattern in the problematic scenario, where the event is not triggered?
In addition it would be best if you could submit a support ticket, along with a runnable sample attached, where the problem resides, as well as exact steps for replication.
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