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TAS5822M: Heat dissipation problem of TAS5822M

Part Number: TAS5822M

We have a model with two TAS5822M design, one TAS5882M is responsible for the function of subwoofer power amplifier, and the other is responsible for the function of full frequency speaker power amplifier. The power supply voltage is boosted to 16V by the battery to supply power to the two power amplifiers. We have adopted a mature solution for this battery booster circuit, and our mass production machine is in use.At present, PCBA plays outside the cavity without any problem, but when it is installed in the closed cavity, it automatically turns off after playing for about 15 to 30 minutes. We have installed a heat sink on the back of each power amplifier (PCBA). The size of the heat sink is 45*7mm, and the height is 10mm.May I ask how I should handle this difficult case?E500 .pdfe500 SCH.pdf