I have also had this happen a few times when playing(KotH), at first I thought it was just me it was happening to, like some random thing that happend to people with the patch but as rogerx said, it seems to be tied to the server.

Last time it happend to me I joked about it in chat as I usually do, that my guy needed his coffe fix. Thing is others said that they also just started shaking, im not sure if its the entire server that gets it but it does seem to come from the server and affects multiple people at the same time.

I also think this has only occured when I have been using a sniper rifle, tho it does stick to you and switching weapons doesnt help after you get the shakes.