Lna gain tqp3m9036

TQP3M9036 GAIN IS DROPPING AFTER 10 MINUTES. THEN SWITCH OFF THE VDD +5 V. . AGAIN SWITCH ON VDD GAIN RECOVERS .
MY FREQUENCY OF OPERATION IS 100 MHz TO 600 MHz.
IN THE WHOLE OPERATION PIN 6 IS LOW VOLTAGE.
WHEN THE GAIN DROPS VDD IS PRESENT AT PIN 7.
WHEN GAIN COMES CURRENT IS 68 mA.
C1,C2,C3= 100 PF, L= 68 nH

To ensure the device operation normally, the Pin 6 voltage needs to be 0.0V, not higher than +0.1V.