osmo-bts-trx: "No clock from osmo-trx"

Hi Tom and others, in our testing setup, we have sporadic failures (~2 out of 10 times) with: DOML <0001> bts.c:208 Shutting down BTS 0, Reason No clock from osmo-trx What would be possible reasons for this failure, and how can we go about fixing it? Some more logging around it: 20170614032014399 DRSL <0000> rsl.c:2333 (bts=0,trx=0,ts=0,ss=2) Fwd RLL msg EST_IND from LAPDm to A-bis 20170614032018533 DL1C <0006> scheduler_trx.c:1451 PC clock skew: elapsed uS 4136730 20170614032018533 DOML <0001> bts.c:208 Shutting down BTS 0, Reason No clock from osmo-trx 20170614032018533 DL1C <0006> scheduler.c:240 Exit scheduler for trx=0 20170614032018533 DL1C <0006> scheduler.c:216 Init scheduler for trx=0 20170614032018533 DOML <0001> oml.c:280 OC=RADIO-CARRIER INST=(00,00,ff) AVAIL STATE OK -> Off line [...] Shutdown timer expired (We're using an external 10MHz OCXO timing source) It appears there's four seconds of nothing from osmo-trx? Most curious is that the next run will be completely fine, until some time later we get this same failure. We wait until osmo-trx logs -- Transceiver active with 1 channel(s) and then we "immediately" or up to a second later launch osmo-bts-trx. Would it help to give it more grace time?? Thanks! ~N