I was planning on posting this same question.
I get the same spikes on a STOCK 411 using the latest firmware. Sorry, I'm at work and don't have the latest scan, but I'll post it later. Basically, I get the same regularly spaced spikes (not single peaks, they have a little width as well) burning 4x RiData's. I didn't always get them, it's been a more recent occurence (no firmware change, but software updates of Decrypter which is what I use for burns).