Graphics Bugs

This has happened to me twice in the past day or so, what I'm seeing is this:

— The flame around fire staffs disappear (the "bubbles" still show), see picture below.
— Light sources in the game (fire ones in the forest) look glitchy/flickering.
— The target line to enemy either disappears completely, or only shows a little.

http://img146.imageshack.us/img146/7412/img0307.png

The light sources thing is only noticeable as you're playing so I don't have a screen shot for that.

As for how this happens, the first time I noticed it yesterday, I'd had the front page of Pocket Legends on for a long time (forgot to close it while I did something else). I rebooted my iPhone just to make sure, but the second time it happened a bit later I'm pretty sure I'd similarly left the game running on the front page while doing something else for a while, or at least I wasn't in any game/towne. Sounds very vague, but otherwise it hasn't happened, and if I close and restart it (without rebootig the iPhone) it's back to normal.