Preventing Servos from Jumping??

My servos sometimes jump slighly in one direction or the other on
power up. This is probably considered normal but I was just
wondering if there is anything I can do to prevent it.

Sometimes I get halfway through a batch of parts and need to leave
the shop or something, and when i power the controls up when i get
back it often requires re-zeroing. Not a really big deal, but if
there is a way to prevent it, id love to hear it. Thanks.

Mark