There are following reasons for Sudden drops-
1.- There could be sudden loss of SS like indore coverage problem.
2.- There could be any H/W issue due to which site get fluctuated.
3.- There could be any issue on transmission link, we can check Slip, SES, UAS….. using DTQUP:Dip=all, print.
In case of sudden loss there must be downtime on the cell.
please how can the bts logs(Ericsson RBS2216)be analysed.the site is recording high drops due to Sudden lost connection on one cell and a check on the RBS logs has some lines with P_mpsk_clock timeout_clock_main C:404.