A cell having all Layers 4G/3G/2G.
CSFB happen normally on the cell.
If you lock the mobile on 2G, call not connected to this cell.
We are on the main Lobe of the cell.
2G Coverage also not showing on this specific cell, 3G/4G it showing normally.
Physical audit has been done, no abnormally showing.
In Stats it showing nearly zero Traffic.
Neighbor cells having high traffic due to this issue.
Paramters audit has been done.
Check other cells where same settings applied, do you face same issue?
If not, so it might be resources hanging at 2G site, a BTS restart may resolve it. (But make sure that this problem only at this cell not at network level).
Check if trx is ok, or have alarms.
Check territory Edge and Gprs.
Check sdcch distribution.
The 2G UE see the site or no? In idle mode for reselection?