Hammad,
M2UA/MTP2 User Adaptation Layer Link Overload Alarm usually occur, especially during peak hours, when an M2UA Link reaches maximum or above normal performance utilization. Make sure that all 4 M2UA Links are set to “Load-Sharing” traffic mode and all 4 ASF values are flagged as “Active”.
Does all of these 4 links resides on the same BGSI Module?