Unplug and replug doesn't (usually) work. I'll try the travel adapter trick to see if it works though, thanks!
[MENTION=759220]Adam Smith[/MENTION] is right though, I think it is just many of them are just inoperable. This year off the top of my head:
767: 0/2
320: 0/2
E190: 1/1
E175: 0/1
So yeah [MENTION=29064]yyznomad[/MENTION], all older / XMed planes. I've got a bunch of 787-9 flights coming up which, based on my experience in the last couple of years, are much more reliable.