I don't suspect that your iSCSI initiator is having trouble connecting to the volumes - and that your problem is, in fact, isolated to ASM/ME.  Check the RUNAS account used on the ASM services to ensure they are using the proper domain credentials.   
Hi, I have a customer with a Hyper-v FailoverCluster and CSV's. They recently changed their internal domain name, and since then they are haveing trouble connecting to the PS-Group in Auto-snapshot manager. I get an error saying: An error occured processing action: Discovering.Exception has been thrown by the target of an invocation.  I hope someone can point me in the right direction:)  Anders
Problem with Auto-Snapshot manager after domain change