I get this error a lot on Android 64 bit version of the game. It appears when logging in fails despite having correct info. Something similar might be causing people to be booted from the game, too. Are you seeing the error, too, or just having trouble connecting?
Here's the error message:
Condition: NullReferenceException: Object reference not set to an instance of an object.
StackTrace: NetworkUtils.LoginRegisterManager+<Login>d__24.MoveNext () (at <00000000000000000000000000000000>:0)
UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <00000000000000000000000000000000>:0)
UnityEngine.Events.UnityEvent.Invoke () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchPress (UnityEngine.EventSystems.PointerEventData pointerEvent, System.Boolean pressed, System.Boolean released) (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchEvents () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.Process () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule:Process()
LogType: Exception
Condition: NullReferenceException: Object reference not set to an instance of an object.
StackTrace: NetworkUtils.LoginRegisterManager+<Login>d__24.MoveNext () (at <00000000000000000000000000000000>:0)
UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <00000000000000000000000000000000>:0)
UnityEngine.Events.UnityEvent.Invoke () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchPress (UnityEngine.EventSystems.PointerEventData pointerEvent, System.Boolean pressed, System.Boolean released) (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchEvents () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.Process () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule:Process()
LogType: Exception
Condition: NullReferenceException: Object reference not set to an instance of an object.
StackTrace: AntiCheat.DigimonStatsChecksum.ValidateChecksum () (at <00000000000000000000000000000000>:0)
UnityUtils.SaveLoadManager.Save (System.Boolean forcefully) (at <00000000000000000000000000000000>:0)
AndroidUtils.FocusHandler.OnApplicationPause (System.Boolean pauseStatus) (at <00000000000000000000000000000000>:0)
LogType: Exception
Condition: NullReferenceException: Object reference not set to an instance of an object.
StackTrace: NetworkUtils.LoginRegisterManager+<Login>d__24.MoveNext () (at <00000000000000000000000000000000>:0)
UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <00000000000000000000000000000000>:0)
UnityEngine.Events.UnityEvent.Invoke () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchPress (UnityEngine.EventSystems.PointerEventData pointerEvent, System.Boolean pressed, System.Boolean released) (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchEvents () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.Process () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule:Process()
LogType: Exception
Condition: NullReferenceException: Object reference not set to an instance of an object.
StackTrace: NetworkUtils.LoginRegisterManager+<Login>d__24.MoveNext () (at <00000000000000000000000000000000>:0)
UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <00000000000000000000000000000000>:0)
UnityEngine.Events.UnityEvent.Invoke () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchPress (UnityEngine.EventSystems.PointerEventData pointerEvent, System.Boolean pressed, System.Boolean released) (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchEvents () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule.Process () (at <00000000000000000000000000000000>:0)
UnityEngine.EventSystems.StandaloneInputModule:Process()
LogType: Exception
Condition: NullReferenceException: Object reference not set to an instance of an object.
StackTrace: AntiCheat.DigimonStatsChecksum.ValidateChecksum () (at <00000000000000000000000000000000>:0)
UnityUtils.SaveLoadManager.Save (System.Boolean forcefully) (at <00000000000000000000000000000000>:0)
AndroidUtils.FocusHandler.OnApplicationPause (System.Boolean pauseStatus) (at <00000000000000000000000000000000>:0)
LogType: Exception