I know this is a little old, but we are having the same issues with 5060s running 4.0.5. Intermittent application drops, routing issues where routes expire and flip to another device and packet filters that don't filter to name a few. I have two open tickets and had to remove the pair from production.
Are you still having the same issues with the 50xx platform?
We've had three devices go completely unresponsive; no network or console response. With no other option than a power cycle, sometimes the boxes would enter a strange boot state, like sitting at a bootloader prompt. Other times, they would boot normally. When we'd open a case about this, Support would request that we RMA the devices.
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