I have a HTC One S with stock ROM (latest update) and stock launcher, no root or anything. Android is 4.0.4 ICS. HTC Sense 4.1. In sound settings, for the normal sound profile, I turn vibration for calls/messages/notifications off, but after some time it mysteriously comes back.
I don't know what triggers it. It happens after switching profiles a couple of times, like switching to vibrate profile and later switching back to normal. I have a suspicion that it might be related to using the physical volume up/down button to switch the profile. I usually use the stock 1x1 HTC widget to switch between profiles. It kind of annoys me and I consider it a bug. Does enyone experience the same? How can I prevent it?
Update: it just happened again after a system crash. I'm getting these more frequently lately, and after every crash the vibration is back. I can now list this as a confirmed trigger, but I'm not sure if it's the only one.