Hi, Sorry Guys I was away.
Dear Pix, Below are Answers to your Queries
– Yes you are right, dip in RTCH avail appeared (due to power or Transmission etc ) and after the avail is restored 100% we have degradation, Note that after the site is UP, some time only 01 cell out of 03 will be impacted, sometime site itself will be OK after it is UP but front facing neigbor will be impacted.
We have done all actions listed by you, Lock/unlock BTS, BTS restart, power OFF/ON,Abis change, delete recreate, change HW, change SUMX tried some diff BCCH & MAL List.
Drops are only Radio + handover. BSS & RTC drops are zero