we've given up on the 4410n. we have two of them, one at the front of our office, one at the back (we have a floor in a highrise in san francisco). the one at the rear of the office - version one hardware, has never had any trouble. it just runs and runs and runs, has been up in the false ceiling for more than a year now. the one at the front of the office started giving us trouble within months of installation. not passing traffic. took it down from the false ceiling and kept it on my desk. staff got in the habit of just power cycling it when the first person showed up in the morning, since it always locked up overnight. RMA'ed it, got a version 2 hardware unit. seemed better initially - but it was faking it. same problems. going unresponsive overnight. gave up.
bought a $40 TrendNet AP. not a single problem in the month it's replaced the 4410N.
better quality hardware at less than 1/4th the price. wow. never buying a cisco WAP again.