E51 issue

Question

I have encountered a wierd problem with my new E51. I think it is a software issue, but I didn't send for re-installation since I didnt have a spare phone. Just sharing this problem to see if i'm alone:
My E51 has consistently log on to the internet by itself daily from 5pm to 7am the next day, at a half-hourly interval. All logon attempts were logged at the call-logs. All due diligence checks done, configuration is at 'when needed'. There was once after 5pm when the first logon over, I had tried changing the timing back to 2pm, and the auto logon symptom stopped, showing that it is indeed local phone issue, nothing to do with network. I have no idea when it started, I have only noticed it last month when my roaming bills shown additional charges due to this unknown logon that sends up/down few kB everytime and logoff by itself in 10-30 secs.
Could this be a virus? To temporarily overcome this problem until i do a re-intallation, I have changed the APN name. Currently the auto logon still take place, but 0kB transmitted and connection terminated in 3-4secs. Any advice?
On the other hand, I have tried to do my own phone update but it failed. Downloaded the phone software updater, connected and detected the phone, but during updating process it gave error that said connection lost.. I do not know how to overcome this..

Answer 1

Check if you have Mail for Exchange or other mail client set up on the phone.
If you have, check the peak and off-peak time settings and intervals for synchronization.
Please let me know if this helps.