TC_rr_response_frame_loss BTS_Tests_LAPDm:hopping

Failing for the past 336 builds since #2740

Took 6.6 sec (from Titan)

Stack Trace

Timeout waiting for RR or REJ
      BTS_Tests_LAPDm.ttcn:1492 BTS_Tests_LAPDm control part
      BTS_Tests_LAPDm.ttcn:1239 TC_rr_response_frame_loss testcase