Thanks Anurag, Chris, Peter and the Isotope Queen herself (!),

I figured it was likely a filament issue but was really thrown by how fast the currents were flickering back and forth. We will swap the filament and give the source a good clean (it is probably overdue...) and hopefully that will resolve the issue.

Thanks again, I very much appreciate having such a great community to pose questions to.
Ben

´╗┐On 10/30/20, 4:06 PM, "Stable Isotope Geochemistry on behalf of Peter R" <[log in to unmask] on behalf of [log in to unmask]> wrote:

    Howdy!

    When I experienced this I just swapped it with a new filament. The box and trap values no longer oscillated and everything continued working like normal. I think it's something that happens with a filament that's on its way out, however, our oscillating filament kept working for weeks after I noticed this happening. I just changed it because it was annoying to look at / fear it would go in the middle of a sequence. 

    Best,
    Peter R