It's very strange problem . Most of the time the coverage is full .I noticed that when I'm playing Rally Pro and minimize the process with "End call" button I don't have coverage .After few seconds it comes back and starts slowly to lose it until I completely close the game - then everything becomes normal.This happens sometimes when I'm just browsing the phone . When no apps are started everything is just fine. I have the feeling the resources of the phone are not enough .I formatted the phone and it's almost empty
with no apps .My firmware is V 4.0537.0 19.09.05 .
Any ideas can this problem be solved ??

The signal is very low on 3230, unfortunately and when you hold it in your hand is even lower. This was one of the many reasons for which I sold it.