oven won't stay lit

howdy,
my whirlpool gas range’s oven will not stay lit.
warms up then keeps trying to light. slow ticking of ignitor, but will not relight.

bought and installed new igniter/burner assembly (part 8191123).

seemed to work great…for a little while (one test run).

now the same old trouble is back, except the stove top igniters are ticking while the oven refuses to relight.

any insight?

thanks