Hi I'm John I will help you with the cooling problem.
The metal between the two doors tell me if its warmer than usual please.
Its warm because the coils under the fridge are dirty or the fan motor by the compressor isn't going, pull the fridge out and remove the bottom panel and clean the coils it should fix the problem.
if you require more assistance let me know please,
It gives the compressor a chance to cool off thats why it works for a short time .
The coils should be cleaned at least one a year for proper operation.
The number 730 is the condenser to keep clean.