I have recently run into this problem myself, where an SX20 will randomly stop communication at the USB port after a few days. The units (6 so far) I am seeing it on are running either CE9.3.2 or CE9.5.0. Is this a bug that has snuck it's way back in possibly? This is the latest info I have found on this particular issue so far and it looks like the bug was fixed in 6.1.X.
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