[Resolved]  Sony Ericsson — No proper network coverage

This bloody Sony Ericsson shows 'No access to network' atleast 5 to 6 times in a day. I dont know why this happens while other mobile with same network gives proper coverage.
I bought new handset just 5 months back and now I am facing problem with network I even dont know when the coverage fails, every time I have to restart the handset to get the coverage back :(
Second thing I am facing problem with joystick it is not working properly when moving down it functions as enter button. Most of the time while looking down at contacts the calls goes automatically :(
Am really unhappy with the features of my handset. This is the first time I am experiencing SE but I am damn sure I wont be using this next time.

And I have found some similar cases and complaints against SE Service Center. They don't keep updating their technical knowledge, only thing they know is to reload the SW by flashing and if the problem relates with HW they simply tell that the particular parts needs to be replaced (they wont take any alternate solution).

I am really upset with this.