Heat usually causes freezers to break down...
last week my freezer just stopped running. I called in a repairman and he replaced the fan. I came from a weekend off and the fan is running but the freezer was at 50 degrees. I lost over 50 lbs of meat and seafood. So I left the restaurant and took a tour of the town to find meat so I could open for service.
I know its the thermostat which would cause the fan to burn out because it could never reach the low temp.
I'm just venting my frustrations... I don't feel bad for the loss of money I just feel bad for the poor shrimp and steers that lost their lives for nothing.