With the push to stable of .45 there is a new bug that was NEVER BEFORE SEEN in experimental.
This bug causes periodic lag spikes between the player and the server which last 30-90 seconds. Spikes occur at least every half hour to hour.
During these spikes the player can not switch weapons, open doors, or move without rubberbanding.
This is a different kind of rubberbanding and it manifests in 2 ways.

1: you run of some distance and are then the game takes control of your character and plays your last few seconds of action backwards, including mouse movement.

2:you bump up against an invisible wall that can not be crossed.

sometimes when these periods of lag occur you seen a solid yellow chain like the one that indicates that the server has restarted.