We experienced similar issue - about five out of ten TLC555CP parts got hot and did not work. Power to ground measured about 15 Ohms. The circuit was copied from Figure 22 of TI Ap Note SLFS022I (2014). The RC was adjusted to have about 16.5ms. The applied voltage was 15V.
After experience above, we tried just first stage alone. The output pulse changes everytime when Trigger was grounded momentary via toggle-push switch. The pulse width varied from 200 to 280 ms typically instead of 16 ms.
The part marking is 69AFNPM, TLC555CP.
Thanks.