It’s not really a warp though and I never had problems with that other than the normal during a big furball.
They disappear completely, no icon, no silhouette, nothing. After a few seconds they reappear. Someone said they had film of it. If you do, mark the time down and send it to HTC. I wasn’t recording at the time and didn’t think to turn it on, I just thought it was a temporary funky not a bug funky.
Was on last night and didn’t have a problem.