Sony WH-1000XM6: Notifications Arriving Late or Not at All
Notifications Arriving Late or Not at All on the Sony WH-1000XM6: what we found on our own £399 unit, the checks that resolve it, and when it is a warranty case rather than a setting. Messages appear...
Priya Raghunathan
The symptom
Sony WH-1000XM6, codecs SBC, AAC, LDAC. Notifications Arriving Late or Not at All is the fault being chased here, on a unit bought and tested rather than loaned. It is genuinely good at excellent multipoint switching, and the thing that repeatedly cost it marks was expensive.
Messages appear only when you open the app, sometimes hours after they were sent. That is the behaviour; what follows is how it tends to present on this particular Sony, and what to rule out first.
First, a note: Work through these in order. The first two resolve the majority of cases and neither risks your data.
Start here
| 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 Sony warranty makes some of the steps below unnecessary — check before you start pulling things apart. |
The full procedure
- Check whether battery optimisation is enabled for the affected app and exempt it.
- Confirm background data is permitted, particularly on a metered connection.
- Check Do Not Disturb and any focus or schedule modes that may be filtering silently.
- Reinstall the app so its push token is reissued.
- Verify the device clock is set automatically — a skewed clock breaks push delivery.
When that is not enough
If several apps are affected at once, the push service connection itself is failing and a reset is the practical fix.
Preventing a repeat
Exempt genuinely time-sensitive apps from aggressive battery optimisation when you install them.
What usually causes this
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 Sony WH-1000XM6 specifically — expensive, which narrows the margin before anything else goes wrong. That is why the steps above start with the cheap reversible checks: on a Sony device the expensive diagnosis is almost never the one you needed.
What not to do
- 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 expensive — it treats the symptom and shortens the life of the cell
- Do not open the case while it is under Sony warranty; that is the one step you cannot undo
When to call it a fault
If the behaviour persists after a factory reset, it is worth raising with Sony 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 audio we have covered, the category archive lists every review in date order. The closest comparisons we have published are Sony WH-1000XM6: Screen Becomes Unresponsive in Places and Sony WH-1000XM6: Storage Full but Nothing Obvious to Delete.
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.
