Probably packet loss, I have it quite frequently and it makes my game lag out for a moment like in your video. You can check it out by doing the following:
Open a command prompt on a client PC, via the Start Menu search for "cmd".
Type "ping -n 20 8.8.8.8".
This will ping the address 8.8.8.8 20 times. Substitute 8.8.8.8 with whatever address must be tested to.
Once the command has run, a summary will be presented indicating if loss occurred.
If no loss occurred, try increasing the "-n" value to something higher (such as 100) to test for a longer period of time.
If you do have packet loss, try tightening up your network cables with a tape and see if it helps.
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