Symptom:
UE was doing flip-flop between Src-FAP and Target-FAP. Iurh-based Handoff was triggered  for single CS-RAB and Tgt-HNB sent TNL Update towards the HNBGW. Subsequently, HNBGW received RUA-Connect for the PS-domain for the same UE from the Src-HNB. HNBGW received another TNL Update now, with multiRAB (CS + PS) for the same UE within 5 Seconds.

UE with multiRAB(CS + PS domain) was succesfully Relocated to Target-HNB from Src-HNB via Iurh-Based Handoff.  Subsequently, HNBGW triggered RUA-Disconnect for the CS-domain towards the Target-HNB in one particular case, which lead to CS- domain Call-drop at Target-HNB.
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Conditions:
UE was doing flip-flop between Src-HNB and Target-HNB resulting in Iurh-Based Handoff Relocation  for single-domain (CS), Iurh-Reloc Cancellation and another set of Iurh-based Handoff. In between, another domain RAB (PS) was also established from the Source-HNB for the same UE and thus, the new TNL Update contained multi-RAB (CS + PS) and the UE was successfully Relocated to Target-HNB.  All these things were performed before  the Iurh-Guard-timer expiry time.