What device are you using and what browser?
I made a lengthy post about this on the Perchance Reddit in the last couple weeks, but I'm glad you posted this here, because anecdotally, I've definitely been seeing an uptick in people (so far all mobile users) saying that they have run into this in the last couple of months and I think the more info we can provide, the better the chances of the dev being able to troubleshoot it. As far as I can find, once it happens the first time, your chats will continue to repeatedly get deleted every so often on that device. Clearing cookies and cache does not seem to fix it. So far, the only fix I've seen reported is installing a different browser or reinstalling the browser.
Sometimes I've gone quite a while without things getting wiped and I'll end up with 10-20 chats. Other times, it gets wiped three times in one day despite having only one chat that wasn't even very long. I haven't been able to find any sort of pattern. It's not even about inactivity, because it can get deleted mid-reply (i.e., one AI reply works fine, but then I go to send my reply, and at some point while I was working on my reply, my data got deleted) I've decided to take a break from using it on my phone for a bit, until the dev has had a chance to troubleshoot the issue.
@perchance@lemmy.world, if you happen to see this, I'd love to know if it would be helpful for people affected by this bug to submit a feedback form through the website every time they encounter this error, or if that's not informative and would just be spamming you. ๐
How about sending this to the dev in a more private way (such as through the feedback form on a different generator) so that you're not linking a bunch of people to it...? ๐ I'm glad you're trying to get it taken down though.
EDIT: I know that the feedback forms say they're public, technically, but I've never actually seen anywhere it's publicly posted. At the very least it's probably much more private than Lemmy.