Karne we have seen this also, using the new commands in S11 (I think)
It is likely that you have depending on your config, and the way the transmission is mapped
1) either a single TRX with issue
2) You use Aggregate bearers and this is an indication of far end link.
3) The errors are low enough not to cause a problem at “Mb but are likely to be causing service degradation. Also look for “unsolicited datalink re-establishment alarms” at the BSC