Xiaomi Internet Stops Working After Midnight

Quick Answer:
If your Xiaomi loses mobile data at night (usually between midnight and 6am), first check if the issue affects WiFi too – if WiFi works but mobile data doesn't, the problem is often carrier-related. Check your carrier's network status page for scheduled maintenance, and check if your data allowance resets at midnight. If neither is the cause, disable battery optimisation for key apps.

Applies to Redmi, POCO and Xiaomi Phones

This guide applies to Xiaomi, Redmi and POCO devices running MIUI or HyperOS, including Redmi Note series, POCO X/F series, and Xiaomi flagships.

🔍 Quick Start – Find Your Path

  • If WiFi works but mobile data stops at night: Go to Section 1 (Carrier-related issues).
  • If mobile data stops when phone is idle/screen off: Go to Section 2 (Battery optimisation).

Section 1 – Carrier-Related Issues (WiFi Works, Mobile Data Stops)

If WiFi works but mobile data stops at night, the issue is often on your carrier's side.

Check your carrier's network status:

  • EE: ee.co.uk/network-status
  • O2: o2.co.uk/network-status
  • Vodafone: vodafone.co.uk/network-status
  • Three: three.co.uk/support/network/status

If your carrier reports scheduled maintenance, wait 2-4 hours – it should resolve automatically.

Check your data allowance reset time:

  • Open your carrier's app and check your data allowance.
  • If your billing cycle resets at midnight, your connection may briefly drop while the system refreshes your allowance.
  • If you've exceeded your allowance, your data may be cut off until the next billing cycle.

If neither is the cause: Call your carrier and ask if there are known overnight issues in your area (mast maintenance or network optimisation).

Section 2 – Battery Optimisation (Mobile Data Stops When Idle)

If mobile data stops only when your phone is idle or screen is off (and works again when you wake it), battery optimisation is the likely cause.

Try these in order:

  1. Turn off Battery saver – Settings → Battery → Battery saver → OFF.
  2. Turn off Data saver – Settings → SIM cards & mobile networks → [Carrier] SIM → Data saver → OFF.
  3. Disable "Clear cache when device is locked" – Settings → Battery → Additional features → Clear cache when device is locked → OFF.
  4. Remove battery restrictions for important apps – Settings → Apps → Manage apps → Select app → Battery saver → Set to "No restrictions".

Section 3 – Reset Network Settings (Last Resort)

⚠️ Removes saved Wi-Fi passwords and paired Bluetooth devices. Does not delete photos or contacts.

Path: Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth

After reset: Restart your phone → Reconnect to WiFi → Test mobile data at night.

Only do this if Sections 1-2 didn't work.

Why Does Mobile Data Stop at Night?

  • Carrier maintenance: UK carriers often perform overnight maintenance between midnight and 6am.
  • Data allowance reset: Your billing cycle may reset at midnight, causing a brief disconnection.
  • Phone deep sleep: Battery optimisation may cut data to save power when the phone is idle.

Quick Questions

Why does my Xiaomi lose mobile data overnight?
Most commonly carrier maintenance, data allowance reset, or battery optimisation. Check your carrier's network status page and your data allowance reset time first.

Why does mobile data disconnect when my phone is idle?
This is almost always battery optimisation. Turn off Battery saver and Data saver in Settings.

Why does 5G disappear at night on Xiaomi?
Your carrier may switch to 4G overnight for maintenance or power saving. Check with your carrier.

Can HyperOS turn off mobile data in the background?
Yes. HyperOS battery optimisation can restrict background data. Turn off Battery saver and Data saver to prevent this.

Will resetting network settings delete my photos?
No. Only saved Wi-Fi passwords and Bluetooth devices are removed.

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