Galaxy S25 Ultra: Bluetooth Keeps Disconnecting
Bluetooth Keeps Disconnecting on the Galaxy S25 Ultra: what we found on our own £1249 unit, the checks that resolve it, and when it is a warranty case rather than a setting. Audio cuts out for a secon...
Aisha Bello
What you are seeing
Galaxy S25 Ultra, screen-on time 7h 30m. Bluetooth Keeps Disconnecting is the fault being chased here, on a unit bought and tested rather than loaned. It is genuinely good at a flat display that suits stylus work, and the thing that repeatedly cost it marks was more duplicated first-party apps than anyone needs.
Audio cuts out for a second at a time, or the connection drops entirely when you move between rooms. That is the behaviour; what follows is how it tends to present on this particular Samsung, and what to rule out first.
Before you start: Work through these in order. The first two resolve the majority of cases and neither risks your data.
The quick checks
| Check | Why it matters |
|---|---|
| Is it reproducible? | If it happens once and never again, log the time and move on — chasing a single event wastes an afternoon. |
| Has anything changed? | A firmware update, a new app, a new accessory. The cause is almost always the most recent change. |
| Does it happen on a fresh restart? | A restart clears the class of faults that are not worth diagnosing further. |
| Is it under warranty? | The Samsung warranty makes some of the steps below unnecessary — check before you start pulling things apart. |
The full procedure
- Forget the device on both ends and pair it again from scratch rather than reconnecting.
- Move away from the 2.4GHz band congestion — microwaves, older Wi-Fi networks and USB 3 hubs all interfere.
- If the source supports it, switch from LDAC or another high-bitrate codec to AAC and see whether stability improves.
- Disconnect other paired devices; multipoint connections are a common cause of intermittent dropouts.
- Update firmware on the accessory itself, which usually requires the manufacturer app rather than the phone.
When that is not enough
Persistent dropouts on multiple sources point at the accessory rather than the phone. Test with a different device before contacting support, because that is the first thing they will ask.
How to stop it recurring
Keep the accessory firmware current and avoid keeping more paired devices in range than you actually use.
The usual cause
In our experience this is rarely a single fault. The common pattern is an accumulation: a background process that was fine on its own, a setting changed months ago, and — on the Galaxy S25 Ultra specifically — heavy at 232g, which narrows the margin before anything else goes wrong. That is why the steps above start with the cheap reversible checks: on a Samsung device the expensive diagnosis is almost never the one you needed.
Things to avoid
- Do not change several settings at once — you will fix it without ever learning what caused it, and it will come back
- Do not install a third-party "optimiser" — on modern hardware these do nothing the operating system is not already doing
- Do not factory reset before backing up, and do not restore that backup immediately afterwards; if the cause is in the backup you have simply reinstalled it
- Do not leave it on charge overnight as a workaround for heavy at 232g — it treats the symptom and shortens the life of the cell
- Do not open the case while it is under Samsung warranty; that is the one step you cannot undo
When it is a hardware fault
If the behaviour persists after a factory reset, it is worth raising with Samsung under warranty rather than working around it. Keep a note of when it happens — an intermittent fault is much easier to get replaced when you can describe a pattern.
Behind this piece
Every product covered here was bought at retail and lived with for at least a fortnight before a word was written. Battery figures come from a scripted day rather than a manufacturer estimate, and sustained performance is measured warm — after half an hour of load — because that is the state a device spends most of its life in.
Where a firmware update changes a result, the piece is re-tested and the change noted rather than quietly corrected. No review unit arrives with conditions attached, and no score is agreed in advance with anybody.
Where to go next
If you are weighing this against the rest of the smartphones we have covered, the category archive lists every review in date order. The closest comparisons we have published are Galaxy S25 Ultra: Device Running Hot and Slowing Down and Galaxy S25 Ultra: Notifications Arriving Late or Not at All.
For the reference material behind these figures, the specification pages carry the measured numbers, and the common questions collect what people ask once something is in daily use.
