Why do objects sometimes get stuck in navmesh?

Question

Unity

I made 2 points A and B at the bottom of the map and at the top, before starting I check the path

public bool GetAccessPath(Vector3 TargetA, Vector3 TargetB){
        bool ret = false;
        MeshAgentPath = new NavMeshPath();
        NavMesh.CalculatePath(TargetA, TargetB, NavMesh.AllAreas, MeshAgentPath);
        if(MeshAgentPath.status == NavMeshPathStatus.PathComplete){
            TargetCell = TargetB;
            MeshAgent = GetComponent<NavMeshAgent>();
            MeshAgent.updateRotation = false;
            MeshAgent.updateUpAxis = false;
            MeshAgent.Warp(TargetA);
            MeshAgent.SetDestination(TargetCell);
            ret = true;
            }
        return ret;
        }

I create an object

++Num;
Obj[Num] = Instantiate(cell) as Cell;
Obj[Num].transform.SetParent(Cells.transform);
Obj[Num].GetComponent<NavMeshAgent>().speed = Speed;
if(!Obj[Num].GetAccessPath(TargetA, TargetB)){ Obj[Num].gameObject.SetActive(false); }

that is, if there is a path, then forward, if not, then the object is turned off, at startup, the speed is also set randomly (0.2-3), in the update it is only checked whether the goal has been reached

if(Vector3.Distance(transform.position, TargetCell) > 0.5f){  .....

Quality =none, Priority =0, Auto braking = false, Ang speed = 120, Acceleration = 8, radius 0.1, height 0.1
Agent => radius = 0.05, height = 1, step height = 0.001, max slope =
45 objects, many fly, some stop in one place and stay there forever ....
most likely something in the agent's settings, but I've already twisted everything in every way, advise how to set it up correctly, I just need them to move from A to B at a monotonous speed ...
It doesn’t reach how to set it up correctly, and why some fly to the target while others stop ....