dead refridgerator

[SIZE=3]My roper side by side began shutting down to the point where the ice cubes begin melting. When i turned up the temp guage the freezer would then kick on and things seemed fine. but after this happening thee to four ttimes in the last two to three wks. the whole system has become inoperative no matter how high you put the temp settings. Is it worth fixing this 10+ yr. old and what is the problem?? thx. john c.[/SIZE]