Thanks Pix for reply and sorry for giving reply so late.
POC is power control parameter.
In our network we are observing this problem sevearly during network busy hours i.e. when traffic is huge. For RACH we have done some fine tunning on RACH repetation and the multifram spread slots. But it is not giving any improvement.
Can you please share something on timer level.
We have some amount of SD fail because of T3101 expirory also