are a known microbubble trouble-maker.
The alert is not BS if you're doing that, particularly if you do it after you come up from something deeper!
My only real complaint is that it will post the diver alert for VERY transient (and IMHO bogus) ascent speed violations like the one I got today rising up 6' or so at 83' to give a shark a clear path to swim away - not a quick motion either, since it was done entirely with breath control. I suspect that a couple of the others I've gotten have happened when I unclipped the console from my BC and brought it up towards my face as I was starting my ascent - a violation of no more than a second's duration, and NOT a true one, since my BODY wasn't moving that fast (the COMPUTER was, but not my BODY)
It is also obvious that the Vyper doesn't differentiate between total partial pressure change, but instead works on strict distance travelled in the upward direction over a sample period, and that its resolution is probably in feet (rather than sub-foot resolution.) This would explain a lot of things, because you could conceivably get a 3 or 4' change simply by unclipping the console and bringing it towards your face to read it if you caught it JUST wrong (right at the boundary between 83 and 82', for example)
It also explains how you can get nailed with these undeservedly on safety stops and ascents from them under the same circumstances.
I KNOW those are bogus though, since if I get one I go through the profile in the review and look for anything that I might have missed. The SLOW will show up, but you have to look sharp, because it comes and disappears in that single sample....
If I do something like bounce-dive, then those alerts are NOT bogus - and I would not ignore them. You can choose to, but I won't.