I have experienced this same problem infrequently, almost always in casa, and on a rare occasion in bath. However, in Bath, my client has been known to crash on strange occasions (usually when someone gets knifed and sploded in the tunnel by blue spawn).
Going from memory (its been at least a week since it happened so take with a grain of salt) I believe my netgraph didn't show any dropped packets when I would get "stuck". I would usually be walking forward and my keys would be unresponsive for a short period of time (although I could still see movement of team players on the mini map and receive hits at a normal rate). Its frequent for me so I don't think much of it. If it happens frequently for you, you should take a demo (f12) and we can see how your netgraph responds.