In the first attachment you can see that something happened to the TMS osems on Jan 21st that makes the peak to peak noise increse by more than a factor of 10. This is still the case. 

I then took a look at the osem spectra, (the fast channels which are not DQ) and saw a 16 Hz comb in RT and SD (second screenshot).  Without saving I re ran the measurement including TMSY channels for comparison, and then saw that the comb appeared to have gone away.  Spectra of the 256 Hz DQ channels from the time when I originally saw the 16Hz comb are in the third attachment, there is no comb here. 

The last attached screenshot shows the osem spectra for both TMSs that I am measureing now, there is some oscillation around 1800 Hz.  This is very similar to the behavoir reported in 25062  and 20078