[Shin_Akuma26]

Honestly I don't think you have to go back to stock rom because they have nothing to do with it they are just gonna check the settings of the network within your phone if anything they might have to reprogram the phone, but not more than that. I'm telling you this because I had to take my phone in so they can check why my internet was not working and at the time I had another rom running, so they looked at my phone reprogrammed it and voila it was working again.