I have found the same issue connecting using Nautilus when the phone is in MTP mode on a Galaxy Nexus on ubuntu 12.04 LTS, gMTP seems to work occasionally , but takes several minutes to load and cuts out easily. The best I have found was to use a program called Clementine to transfer music. I put the phone in Camera mode and use Nautilus fine to transfer photos and I can manually manipulate the file system using the DDMS in Eclipse for anything else I need.
If it's any consolation I've recorded the stack trace of the event in DDMS and attached it.
I have found the same issue connecting using Nautilus when the phone is in MTP mode on a Galaxy Nexus on ubuntu 12.04 LTS, gMTP seems to work occasionally , but takes several minutes to load and cuts out easily. The best I have found was to use a program called Clementine to transfer music. I put the phone in Camera mode and use Nautilus fine to transfer photos and I can manually manipulate the file system using the DDMS in Eclipse for anything else I need.
If it's any consolation I've recorded the stack trace of the event in DDMS and attached it.