SSL errors

I'm using git2 to periodically check changes in a repository. Sometimes I start getting SSL error: received early EOF; class=Ssl (16); code=Eof (-20) errors while pulling from the repository (github). When such errors start to happen they usually don't stop happening until I restart the service. (And when I restart the service the erros are gone for days)

Is there anything I can do to prevent / help debug this issue?

The pull function looks something like this:

fn pull(repo: &Repository, ch: Sender<Info>) -> Result<(), git2::Error> {
    // fetch changes from remote index
    repo.find_remote("origin")?.fetch(&["master"], None, None)?;

    // Collect all commits in the range `HEAD~1..FETCH_HEAD` (i.e. one before
    // currently checked out to the last fetched)
    let mut walk = repo.revwalk()?;
    walk.push_range("HEAD~1..FETCH_HEAD")?;
    walk.set_sorting(Sort::TOPOLOGICAL | Sort::REVERSE)?;
    let commits: Result<Vec<_>, _> = walk.map(|oid| repo.find_commit(oid?)).collect();

    let mut opts = DiffOptions::default();
    let opts = opts.context_lines(0).minimal(true);

    for [prev, next] in Slice::array_windows::<[_; 2]>(&commits?[..]) {
        let diff = repo.diff_tree_to_tree(Some(&prev.tree()?), Some(&next.tree()?), Some(opts))?;
        
        // Send info
        ch.blocking_send(Info::from(diff)).ok().unwrap();

        // 'Move' to the next commit
        fast_forward(repo, next)?;
    }

    Ok(())
}

/// Fast-Forward (FF) to a given commit.
///
/// Implementation is taken from <https://stackoverflow.com/a/58778350>.
fn fast_forward(repo: &Repository, commit: &git2::Commit) -> Result<(), git2::Error> {
    let fetch_commit = repo.find_annotated_commit(commit.id())?;
    let analysis = repo.merge_analysis(&[&fetch_commit])?;

    if analysis.0.is_up_to_date() {
        Ok(())
    } else if analysis.0.is_fast_forward() {
        let mut reference = repo.find_reference("refs/heads/master")?;
        reference.set_target(fetch_commit.id(), "Fast-Forward")?;
        repo.set_head(reference.name().unwrap())?;
        repo.checkout_head(Some(git2::build::CheckoutBuilder::default().force()))
    } else {
        Err(git2::Error::from_str("Fast-forward only!"))
    }
}

Start with the issue's pull function, especially repo.find_remote("origin").fetch, and investigate the recurring git2 SSL early-EOF error in the long-running service. Compare behavior before and after restarting the service and gather the requested debugging context; done would require identifying a reproducible cause or a concrete prevention or diagnostic path.