iPhone occasionally doesn't ring/vibrate

[mtnDewFTW]

For some odd reason, my iPhone 4 doesn't ring/vibrate when a new text comes in. This doesn't happen very often but it does happen couple times a day. Which is weird.

Anyway, I normally have my iPhone set on silent, so it's just the vibration, and like I already said, it doesn't always vibrate. But then I switched it from that to the ring/vibrate mode and it still doesn't always vibrate and ring.

Anyone else having this issue? Is there a way to fix it?

 

[dockingbay94]

Try a restore in iTunes first.

 

[missygal]

I had that on my 3GS so switched the texting tone for awhile and it worked again. Not sure about it not vibrating...

 

[funkyc]

I noticed my phone do that today too. It was in front of me on my desk and I watched as the light from the screen turned on but there was no noise or vibrate. Picked up my phone and I had an SMS. Checked and it wasn't set to vibrate mode but normal mode.

Got another SMS later on and there was noise and vibrate. Strange

Mine is a 3GS btw