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Magneto-intersubband resistance oscillations (MISO) of highly mobile 2Delectrons in symmetric GaAs quantum wells with two populated subbands arestudied in magnetic fields tilted from the normal to the 2D electron layer atdifferent temperatures $T$. Decrease of MISO amplitude with temperatureincrease is observed. At moderate tilts the temperature decrease of MISOamplitude is consistent with decrease of Dingle factor due to reduction ofquantum electron lifetime at high temperatures. At large tilts new regime ofstrong MISO suppression with the temperature is observed. Proposed modelrelates this suppression to magnetic entanglement between subbands, leading tobeating in oscillating density of states. The model yields correspondingtemperature damping factor: $A_{MISO}(T)=X/\sinh(X)$, where $X=2\pi^2kT\deltaf$ and $\delta f$ is difference frequency of oscillations of density of statesin two subbands. This factor is in agreement with experiment. Fermi liquidenhancement of MISO amplitude is observed.

Temperature Damping of Magneto-Intersubband Resistance Oscillations in Magnetically Entangled Subbands