To Eric4u,
It seems to be faulty TRU or DTRU.If you could move the radios (DTRU/TRUs) to other good sector where drops are still normal…we had similar issue and first trial of that swapping out DTRU on good sector confirmed the bad DTRU..depending upon how many DTRU/TRUs you have on that sector there could be some bad ones….we even tried swapping CDU from other sectors and trying to eliminate the which hardware part could be bad…as you alreaday checked the transport side (T1/E1) errors/severe errors etc but at the same time try to reset the smartjack…and see what happens.Good luck and let me now how it goes.Thanks