Under the circumstances it's probably the ERC. Here is the information you'll need to remove the cooktop and access the ERC to check it's mounting tabs and screws.
Maintop Removal–Slide-In
1. Turn off electrical power and gas to the range.
2. Disconnect gas and power from unit.
3. Remove screws securing top surface burners.
4. Remove surface burner and disconnect spark ignitor wire from surface burner.
5. Raise and remove maintop from unit.
Control Panel Disassembly–Slide-In
1. Turn off electrical power and gas to the range.
2. See “Maintop Removal–Slide-In” for removal.
3. Carefully pull surface burner knobs outward to remove.
4. Remove screws located on front of control panel.
5. Remove screws securing end caps to unit.
6. Remove screws securing control panel to unit.
7. Pull control panel forward and tilt downward.
8. Remove screws securing ERC to control panel.
9. Depress side locking arms, push forward on oven light switch, and disconnect wire terminals from switch.
10.Replace and reassemble in reverse order.
ERC–Slide-In
1. Remove control panel, see “Control Panel Removal–
Slide-In” procedure, (steps 1-6).
2. Remove screws securing ERC to control panel.
3. Disconnect wires from ERC.
4. Replace and reassemble in reverse order.
The service manual for your range is a bit too large to post here on the Forum. The attached information has been extracted from the manual and posted to help you out.