I concur - I helped a friend with a similar problem on his metal pad (I think it was a TX model) last week. After removing the plexi screws to try and fix a sticking panel problem, the panel stopped working, even when re-screwed in. However, a little nosing about revealed that one of the wires under a rubber cover wasn't soldered on all that well and and broken free. So, the intermittent hits were because pressing down sometimes touched the wire to the solder blob and sometimes didn't. Once the plexi was removed, the wire moved away from the solder completely. Thus, properly soldering the wire back onto the blob saved the day.
So I'd say that you should check your wiring, lifting up rubber squares if necessary. If the Afterburner's a model where the plexi panel has a wire soldered to it, you may want to replace that wire as well (check connectivity with a multimeter.)
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