I kept on seeing that so frequently it became annoying. Later, I discovered it stopped when I started to use cloudflare dns with their playstore app. So, I think it must be rate limiting from lemmy.ml itself or some weird dns issue from my service provider.
Same, I've switched to it for the time being. All these apps suck in their own way for the time being. It's so exciting waking up to fresh updates every other day though. I've got them all installed and rotate between them.
I was getting this issue when viewing comments , so I was waiting and waiting for the new release to hit F-droid to see if it was fixed. As of now the new version still isn't on Fdroid so I got fed up and installed obtainium to download always the latest version from GitHub and now Jerboa works fine. I highly recommend doing this.