Riding in a small, tight group, happily drafting. We pass a slower rider and my avatar apparently slams on the brakes to get into the draft of the slower rider, and I lose contact with my group.
This is unrealistic and incredibly annoying. Please stop this.
Zwift - Please fix this!
It has happened to me on both of my last two rides. This morning was particularly annoying. I was working with another rider to catch a group ahead. We were both pulling between 2.7 and 3.2 w/kg when we came upon a group of three riders pulling 1.3-1.5 w/kg. I was less than a meter off the wheel of the rider I was working with, yet I got stuck to one, and then ANOTHER of the slower riders. By the time I broke free, the rider I was working with was long gone.
Why? Please fix.
Bhaltair yes this does happen and it has in Zwift since the beginning of their draft algorithm. It’s better than it used to be though. The trick is anticipate that slower rider coming back through the pack and kick up the watts just a little bit before the rider gets to your front wheel. This will generally keep you from sticking and allow you to pass without any loss in speed.
Yes, I usually do up the power a bit when approaching a slower rider. Sometimes it’s not enough.
Most often Zwift just slams on my brakes to catch the draft of the slower rider.
Yes, it’s very irritating. Especially when you are doing 3.2w/kg in a nice group and get stuck by some guy doing 1.5w/kg. Then you have to go up to more than 5w/kg to get away from the sticky draft and catch your group again.
Even when you do power up to avoid it that doesn’t always work. On the flip side, you can be mean and power up a bit at just the right moment to cause someone else to get the sticky draft. 
I start to use the TT bike much more to avoid this and just ride alone.
I am that slower rider !
Am 64 years old, and doing my best to slow the young down.
He he.
I find the Zwift drafting to be broken in two ways - it has this “flip flop” behaviour where when you approach another rider you either (a) get stuck in their draft or (b) get “slingshot” unrealistically past them - the latter is especially noticeable if you are on a TT bike with someone in your draft - as you approach another rider the rider in your draft can suddenly “slingshot”/whip past you at high speed despite not increasing their power. Its just plain bad physics modelling - the draft effect needs completely reworking and basing on real physics, not whatever bizarre model they are using.