Rajesh,
If you have TRE failures leading to drops, it must be a hardware issue. Try mounting a TRE from another sector within this sector and see how it works.
You’re going for a typical troubleshooting:
TRE
Combiner
Amplifier
Duplexer,
Cables
VSWR
Antennas
Connectors,
SUM card,
good luck 🙂