Sudden degradation on LTE PS CSSR pending on high RRC failure

Dear experts,
I am experiencing sudden degradation on LTE PS CSSR pending on high RRC failure.
The vendor is Huawei.
Any optimization suggestion will be appreciated.
Thank you.

These High RRC Failures are on Signalling or Service?

I am new on Huawei. Any counter to categorized this on U2000?
Also there was huge traffic increase at the same time.

Check these counters in PRS:
image

Thank You.

Analysis for some impacted cluster:

Any optimization suggestion?

Do you have transmission capacity problems?
Can you do IP Path measurement?
Or flow control / congestion?