stove not sparking when oven is on, but works fine otherwise

[aragonne]

Hi,

I have a Kenmore stove/oven model 790.73433312.  The stove lights perfectly fine when the oven is off.  i.e., the spark module clicks and the burners light up.

Unfortunately, if I turn on the oven and once the oven gets hot, the stove no longer lights up ... the stove’s spark module stops clicking and the burners won’t light. 

Once the oven cools down, the stove lights up again as normal.

What might be the cause and how can I repair?

Thanks and appreciate any suggestions!