Updating to 2017.3 and getting weird physics behaviors

Hello,

We have been using Unity 5.6.3 and decided to upgrade to the latest version of unity 2017. My rigid bodies are behaving really strange since then. For example I have a bow that can shoot an arrow using AddForce and now I feel like the arrow is falling down in slow motion or a very "laggy" motion, the FPS is fine it's above 120 while I'm testing.

I decided to try out the 2017.1.3 version and that bug was gone, I thought something has messed up during the importing and decided to give 2017.3 another try, but unfortunately that physics bug is still there, I am not getting any errors in the console. I only recalling getting an error while importing the assets (only on 2017.3 while upgrading), which was "unwrap cl has stopped working", but then the upgrade continued fine.

I am installing 2017.2.2 now to see if I will have any luck there and will update in 2 hours.

EDIT : The same bug is on 2017.2.2

EDIT 2: I found a way to fix the problem by changing:

Code (CSharp):

1. transform.rotation = Quaternion.LookRotation(_rigidbody.velocity);

to

Code (CSharp):

1.  _rigidbody.MoveRotation(Quaternion.LookRotation(_rigidbody.velocity));