I've never used a Lilypad, so I can't answer with any specifics, but your headline snippet "Lilypad powering Servo"
got my attention.... do you mean that literally, ie the power
for the servo comes from the LP, or do you mean more loosely that the control
comes from the LP?
If you mean the power (and I don't even know if an LP has a 5V out like a Uno
), then that may be the problem, and the servo's not getting enough current. Servo funnies often seem to stem from current
issues, where the user thinks all is cool just because the voltage
Providing a servo's 5V from an Uno is marginal: if it's even possible on an LP it might be totally impractical.
So, if you haven't already done so, give the servo its own 5-6V supply, with its ground tied back to the LP's.
If you are already doing it that way, then right now I have no further ideas....