If playback stalls or the picture freezes every few seconds, the issue is almost always bandwidth. HBO Max needs at least 5 Mbps for HD and 25 Mbps for 4K. Run a speed test, then restart your router — unplug it for 30 seconds, not just reboot via the app. If other devices on the same network stream fine, the problem is with the specific device or app install.
A corrupted cache is the usual culprit. On Android, go to Settings → Apps → Max → Clear Cache. On iOS, offload and reinstall the app. On smart TVs, do a full power cycle: turn off the TV, unplug it from the wall for a minute, then relaunch. Updating the app to the latest version fixes a surprising number of crash loops.
If you get an 'incorrect password' error but you're sure it's right, try resetting it through the email link rather than the in-app form — sometimes the app form lags behind the server state. If the confirmation email doesn't arrive, check your spam folder and make sure the address you're entering matches the one used at signup exactly.
Error 100 usually means an authentication timeout — sign out, sign back in, and try again. Error 321 points to a device compatibility issue: check if your TV firmware or browser is outdated. Errors in the 400 range often indicate a temporary server-side hiccup; waiting 10–15 minutes and retrying resolves them in most cases.
If the search bar gives blank results or spins indefinitely, clear the app cache and check your internet connection stability. A packet loss rate above 2% is enough to break search queries even when video technically plays. Switching from Wi-Fi to a wired connection often resolves it immediately on smart TVs and streaming sticks.