I've noticed a strange speed / autothrottle issue has crept in of late.This has only occurred since installing SP1 and starting to use the liveries (not sure if either have any bearing on this)  -In VNAC and LNAV mode and with Autothrottle selected at cruise, the speed/tape fluctuates erratically within 5knots above and below target speed. To compensate for this of course the engine keeps spooling up and down. Very annoying.If I deselect AT the issue goes.Has anyone else come across this as after searching on here I couldnt find anything.Thanks

No - will try this. Thanks.