If the HoYoLAB app freezes on the splash screen or closes immediately, start with the basics: clear the app cache, force-stop it, and relaunch. On Android, go to Settings → Apps → HoYoLAB → Storage → Clear Cache. If that doesn't help, check whether your OS version meets the minimum requirements — outdated firmware is a common culprit.
A failed login usually comes down to one of these:
If your forum post or check-in just spins without going through, the issue is almost always a connection hiccup between your device and the platform's servers. Switch from Wi-Fi to mobile data (or vice versa) and try again. If the problem persists across both, the servers may be under load — common right after a major game update or event launch.
Sometimes character stats or exploration progress stops updating on your HoYoLAB profile. First, make sure in-game data sync is enabled in the game's settings menu. Then open the app and manually trigger a refresh by navigating away from your profile and back. If the data is still stale after a few hours, re-linking your game account through the Account Settings page usually resolves it.
Slow response times on the daily check-in are usually tied to peak traffic hours, especially around midnight server reset. If the page times out, wait a few minutes and refresh — your check-in data is saved server-side, so you won't lose progress even if the confirmation screen doesn't appear.