TCP MAX THPT is degraded from 15M to 6M when more than 8 UEs are connected

Hello experts,

I am anlaysing the logs and seeing in google but couldnt find anything. The problem is ul throughput is suddenly falling to low throughput for some of the ues. for some ues it is working fine. Suddenly the ul mcs is also becoming Zero but the throughput is fine for those ul mcs is getting zero. and also i am seeing a scheduling request failure .Please help me what parameters or the conditions can i check and also from the code perspective