Quoted from Schwaggs:On my AVLE, it had nothing to do with the solder joints, it was all about the connectors that the wiring harness connects to the trough opto boards. Just unplugging them and plugging them back in would make the problem go away for a couple hundred games.
Some people replace the connectors with new Molex connectors with Trifurcon contacts.
I used a very thin layer dielectric grease on the pins applied with a q-tip and the problem has never returned. Some people are against using dielectric grease on pin connectors but I have not had any problems with it yet.
From what I have read on these forums this is the fix, unplugging and plugging back in seems to fix it.
I haven't had this happen yet, but have read a lot of the new sterns are doing this.