an update to my rebooting issue, it now reboots approximately every 2 minutes. yes, 2 minutes. i will post a video when i have the patience to actually sit there and film this frustrating little phone.
the reboot issue has been getting progressively worse, and i'm not sure if it has to do with wifi or not, but i will try the green power and juice defender apps just to see what it does. and while tapping the back doesn't do anything, i will try duct tape. a new battery didn't fix my issue.
as a side note, when i am actively using the phone, it seems to be fine now, but as soon as it is put on a desk or table, the issue starts.
the only thing that i have noticed is that this reboot every two minutes started occuring when i was roaming on another network. other than that, the phone is the same setup and apps.
i have visited a docomo shop, and they confirmed that the handset is "most likely" defective (this was before the every 2 minutes reboot), but due to low stock of the arc in japan, they are unsure when i can receive a new replacement handset. they offered to repair it and provide me with a loaner unit, but due to travel plans i wasn't able to do this yet. with the xperia acro announced officially by docomo on monday, the arc is pretty much outdated in japan, after 1.5 months. 49,000yen, or about $550(?) dollars, and an unusable phone. nice work sony ericsson quality control team.