Mine is doing the same thing. I took the control panel apart and it's still not working ??
Frigidaire Affinity dryer model AEQ7000ESO error code E68 (stuck button). Sometimes a 'stuck button' code really is a stuck button. I took the circuit board off the front panel.On the back side of the front panel, each button has 3 short plastic posts, 2 on one side and 1 on the other.The center part moves to push a longer piece that contacts the circuit board. When I push the top of a front stadium-shaped button, the center plastic piece moves too far, touches the short post, and sticks (maybe due to age). When I push the bottom of the front button, the plastic piece goes far enough to contact the circuit board and not far enough to touch the short post. To prevent a stuck button, we now press the bottom of the front buttons.So far so good. If it happens again, I plan to shave or file a little bit off the top edge of the post to give it more clearance. 1st photo: pencil points to stuck parts. 2nd photo: unstuck parts, 3rd photo: the front of our dryer. 
unstuck parts
front of our dryer
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Can o still use the dryer with the E68 code
Or is there a risk of fire ?
SOURCE: what does error code e68 mean
One of the buttons is stuck closed or shorted. Enter the function test mode and perform the button test to determine which button is stuck or shorted. When determined which button, try to free or unstuck the button then perform the test again. Replace the user interface board when the button is freed but the code still exists.
Press and hold the SELECT and CANCEL buttons simultaneously for 6 seconds to reset the control. When resetting is successful, the buzzer will sound and "rES" will be shown briefly in the display, and then immediately rotate the cycle selector knob 5 turns in the counterclockwise direction to the second position from the bottom.
Press and hold the OPTIONS and CANCEL buttons simultaneously for 2 seconds to enter test mode; the buzzer will sound 3 times and all of the LEDs will flash rapidly.
Rotate the cycle selector knob 4 times in the clockwise direction to enter button test. Press the buttons one at a time and observe the LEDs corresponding to that button light up. The LEDs should light up; otherwise the button is stuck.
Press and hold the SELECT and CANCEL buttons simultaneously for 6
seconds to exit test mode.
SOURCE: Frigidaire Affinity Front Load Electric Dryer
E68 indicates one of the panel buttons is stuck.
SOURCE: Frigidaire Affinity Dryer (model LEQ7000ES0)
right now i took the whole bottom apart from the main brain and so far is working good is not turning off now it may work on your too
SOURCE: Frigidaire Affinity Electric dryer E68 error.
this is a fault code that means there is a stuck key on the board you may have to remove the control panel and check the keys if this does not work you may have to replace the panel or control board
Testimonial: "Thanks I relayed the information to my dad (I'm in CA and he is in FL) and he checking it out."
SOURCE: frigidaire affinity E68. Error message E68. The
Hi Error E68 means that one of the panel buttons is stuck,
press all the buttons lightly and release. You can also take the control board
apart and try to blow air with the help of hair dryer, doing all this should
solve the issue. After this if the issue returns then you should replace the
control. Hope this helps...please post back for further assistance. Daniel
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