N-Series and Sflow

Trying to configure sflow on a N2048 with firmware 6.7.17. If I paste in all my sflow commands, all take and if you use show commands to verify sflow all looks good.  But after about a minute, all the sflow commands then disappear and the show commands show sflow isn't configured.  What is going on?

commands entering

sflow source-interface vlan xxx
sflow 1 destination x.x.x.x 6343
sflow 1 destination owner Auvik timeout 60
sflow 1 polling ten 2/0/2 30
sflow 1 sampling ten 2/0/2 1024
!

Craig