Abnormal CPU usage on SendOutgoingCommands with Unity Android/iOS

Hi! I have recently updated to Unity 5.5 and I'm experiencing the same problem, contrariwise no issues with Unity 5.3 and 5.4. I'm using SDK 4.1.1.7 and I observed the problem both with Android and iOS: abnormal cpu usage (98.8%) when calling "SendOutgoingCommands". The documentation suggests to call the method regularly (2..20 times a second), I tried to gradually decrease the rate and I observed that the problem occurs when calling the method approximately more than 4-5 times a second (and below this threshold the APIs does not work as expected for my game). I tried also to call the method from a Coroutine but it doesn't solved. I attached a screen from my profile.
Thank you for the support!