I’ve been tweeting on and off for the past week about problems that I’m having with my iPhone 3G, now about 10 months old, and iPhone OS 3.1. It seems to be one of the less stable OS releases for me, and I’m having trouble figuring out exactly what the problem is.

What I do know is that with fair regularity, I need to “hard reset” my iPhone about once per day. That is, the screen goes black and the device remains unresponsive to touch, and I have to hold down the Home button and depress the sleep/wake button until the unit reboots, displaying the Apple logo. Then it’s fine until the next time it happens.

The first time I tweeted about this, I received a number of responses from Twitter followers who said the same thing happened to them, and some of them pointed to links on Apple’s own Web site discussion boards from other users who are reporting the same issue. So I know I’m not alone.

To try to fix the problem, I’ve restored the iPhone with a fresh copy of 3.1, but that hasn’t fixed it. I’m running only a handful of applications at this point — nine games and perhaps 13 other apps, in addition to the “built-in” ones that Apple includes. While that may sound excessive to some, it’s comparatively few, especially considering how many are actually in my library — and the total number takes up a relatively small amount of the device’s overall storage capacity — most of the 3G’s storage is being used for music.

When the problem happens, I’m not usually running an app or anything — the phone is usually idle. My only indication that there’s a problem is that all of a sudden my phone won’t work the next time I go to use it. If I have a Bluetooth headset synced, I’ll hear a beep from the headset to let me know the iPhone has disconnected, too.