I have a '14 is350 awd f sport, and every time I shut the car off after a few seconds it makes some weird noises, like actuators or relays buzzing for a few seconds and then does the same after a few minutes, sometimes just randomly for a brief period. Is this normal? I had an isf and is350 2gen before and never noticed such noises with those cars...

 

Could be the steering wheel lock engaging. Also, RTFM - page 8 "Noise from under vehicle after turning off the engine" - some owners report that this also happens right after you shut off the engine, and then again 5 hours later.

http://drivers.lexus.com/t3Portal/do...f/OM53D18U.pdf

 

Mine makes that sound too. Almost the same noise as the LFA guages moving.

 

Mine does that too, as did my 2015 350 F sport

 

I am pretty sure that sound you are hearing is from behind the dash. It is the steering lock motor engaging when you shut off and that sound comes on a sec later after shut off, which then you have the option to turn the wheel slightly to fully lock it. You can turn the wheel left or right but it will not move since its locked. when you are going to start your car with the push start you can also hear the motor disengaging.
That sound you guys are hearing does sound just like the LFA gauge moving.