My bloody Nokia 6234 keeps cutting out on me.? I had the problem when it was under warranty and they fixed it but now the warranty has expired.? The screen just goes blank and it cuts out and then switches itself on again and maybe it would work or maybe just cut out again.? It was happening for about 1-2 days a week and then be fine for the rest of the week, but now it's pretty much most of the time.? Is it a battery issue or should I just bin it?