Goodman 1-stage gas valve switch intermittent

[Brad.B.]

Working on this GMSS920402BNAA 40000BTU furnace, everytime I show up LED blinking once (max # tries lockout).  The drain was a bit clogged so fixed that and lit up right away.  Failed again 5 hours later.  Then noticed the slide switch on the gas valve is very "touchy" and I suppose that the energizing/deenergizing vibration over time puts the switch into the "bad" spot.  You just have to touch the switch, not even start to slide it, and cuts off the gas.  Anyone else seen this?