Problem with my w810i

Hi

I own a W810i and works fine for 2 yrs. But now the phone cant receive signal, cant detect memorystick, cant detect handsfree sometimes and Radio is not working.
After switching on the phone, getting signal for only less than a minute and shows no network coverge. Phone often gives some alert sound but without a message[display will be off]
Tried software update but no use.

Plz throw some pointers regarding this plzzzzzzzzzz.
Thanks everyone.

have u tryed a new battry and to reflash it ur self not with seus

Thankyou Philzfog12.
No problem with the battery since the walkman works fine for many hours. Only problem is no n/w coverage,memory card not detected, and radio not working.

read tutorials and reflash it