I've been having a bit of a problem with my blog. It's a free blog hosted at http://decimatlsov.wordpress.com/ and I'm trying to use a header image, but it doesn't seem to work properly. The image I'm using is the suggested resolution (i.e. 940x150), and when I upload it, it seems to work fine... for about 2 hours. After that, the image breaks and all I see is the "broken image" symbol. I've tried uploading multiple copies of the header, but that doesn't seem to work. Oddly enough, sometimes the images restore themselves after a few hours, but more often than not, they don't.
I can only think this is an issue with the hosting, either there's something wrong with the website code or my image is breaching some sort of filesize boundary. If it's the latter, it might be a nice idea to include this boundary on the page, to stop this happening without apparent reason. I suspect it probably isn't this, though, so I would appreciate some help.
The blog I need help with is decimatlsov.wordpress.com.