The Calculator has a feature that takes it into standby after a certain delay of inactivity. Possible values of the delay are 1 min, 3 min, 5 min, 10 min, and 30 min.
In view of this, your 3 sec value seems too short. I suspect that the batteries are depleted.
In OS 2.x, press 5: Settings & status, then 3:Handheld Setup. Look for drop down box to the right of Power Standby, and select a longer delay.
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