when it shut off are you able to turn it right back ON?
ok have you pulled the unit out removed the vent hose and tried running the unit ?
If so did you get good air flow out of the vent?
ok good air flow but seems hot !!
Is the filter clean?
ok can you check you model number again ?
DX4500EA1WW does not show as a good number.
ok I found it , here is a link to the motor it is getting hot and going off on overload