Frequent disconnections from my blog admin

Hello,

I’m not too sure why, as a blog admin, I am frequently disconnected from my site.

After searching, I landed on this plugin page telling the default session duration on wordpress, if doing nothing, is 24 minutes.

In my case, sometimes I won’t get disconnected during four days, already being logged in when I load up an admin page (most often, the comments), and staying logged in for long durations.

But in average 2 times a week, I’ll open the blog admin, check the comments during 2 minutes, click 4 new tabs to post blog posts, write a first blog post (duration : 3-4 minutes), click to publish it… and find that my session has expired, or find that I have been disconnected and need to reconnect.
The other tabs with post-new.php will then sometimes trigger something surprising to me, I’ll reload them to have a page with my valid logged in status again, write my blog post, and when I click to submit it, I may frequently be shown instead a wordpress page telling a weird question along the lines of “are you sure you want to do this ?” – at which point I hit back in my browser, copy my post’s contents to my clipboard, and click New Post again and submit it again from scratch, this time successfully.

It’s no biggie, not a horrible problem, but it’s still troubling me.
Please, would someone know
– what may cause these disconnections ? (I suspect bots trying to log in, I don’t use the default username but there’s no preventing wordpress from showing my real username in the authors page and in the RSS feed, but that sounds weird, coming from a different IP that shouldn’t be triggering a disconnection)
– how that may be adressed ?

Thanks if you can help ??