Buffering or a blurry picture? How to improve your streaming quality

Few things spoil an evening in front of the TV like a spinning wheel at the crucial moment, or a 4K film that looks as if it’s being shown through frosted glass. Most streaming problems come down to a handful of causes, and you can fix the majority yourself in less time than it takes to make a cup of tea.

The trick is to work out which problem you actually have before you start changing things.

Start by naming the symptom

“It’s not working properly” covers several quite different faults, and each one points somewhere different.

What you see	Most likely cause	First thing to try
Picture pauses with a loading symbol	Connection too slow or unstable for the stream	Restart the router, then move to Ethernet or 5 GHz Wi-Fi
Picture plays but looks soft or blocky	Low bandwidth, or the programme isn’t in 4K	Check the programme’s quality and your speed at viewing time
Jerky motion on pans and fast action	Frame rate mismatch or the TV’s motion processing	Review the device’s display settings and the TV’s motion options
One channel fails while others play	A problem with that particular stream	Try again later, then contact support
Nothing loads at all	Access details or app problem	Re-check your details, restart the app, clear its cache

Buffering has a simple explanation. Your player stores a few seconds of video, known as a buffer, ahead of what’s on screen. When data arrives more slowly than the picture plays, that reserve runs dry and the player stops to refill it.

A soft picture is a different matter. Sometimes the stream simply isn’t 4K: channels and programmes come in HD, Full HD or 4K depending on the source, and a Full HD programme won’t look like 4K however good your screen is. On services that adjust quality to your connection, softness can also mean the player has dropped to a lower bitrate to avoid buffering.

Quick fixes worth trying first

These take a few minutes and solve a surprising number of problems.

1. Restart the router. Switch it off, wait 30 seconds and switch it back on. Give it a couple of minutes to reconnect fully.
2. Restart the TV or streaming device. Use the restart option in settings or unplug it for 30 seconds. Standby isn’t the same thing.
3. Close other apps on the device, especially on streaming sticks with limited memory.
4. Pause heavy downloads elsewhere in the house. Game updates, cloud backups and large file transfers can all squeeze a stream.
5. Try a different channel or programme. If everything else plays well, the problem lies with that one stream rather than your setup.

Fix the home network

If the quick fixes don’t hold, your home network is the most likely culprit. Your broadband line can be perfectly healthy while the link between the router and the TV is struggling.

Go wired where you can

An Ethernet cable from the router to your TV or streaming device removes almost every Wi-Fi variable at a stroke. If running a cable across the room isn’t practical, powerline adapters, which carry network data through your home’s electrical wiring, are worth a try, though results depend on the wiring itself.

Make the most of your Wi-Fi

• Connect to the 5 GHz band rather than 2.4 GHz. It’s faster and less crowded, although its range is shorter.
• Keep the router out in the open and raised up, away from thick walls and large metal objects.
• Shorten the distance. If the TV is two floors away, a mesh Wi-Fi system or an access point near the TV can make a dramatic difference.
• Count the devices. Every phone, tablet, console and smart speaker shares the same connection, and several people streaming at once adds up quickly.

Test properly

Run a speed test on the device you stream with, or right beside it, at the time you usually watch. Evening results are often lower than daytime ones because more people in your area are online. Speed tests report megabits per second (Mbps), and the major streaming platforms generally recommend around 5 Mbps for HD and 15 to 25 Mbps for 4K. Our guide to internet speed for 4K streaming explains how to read the results and why consistency matters as much as the headline figure.

Check the device and its settings

When the network checks out, turn to the hardware and software.

Is it really outputting 4K? In your streaming device’s display settings, confirm the output resolution is 4K rather than 1080p. If 4K isn’t offered, the device may be plugged into an HDMI port that doesn’t support 4K and HDCP 2.2, or connected with an older cable that isn’t rated for 4K.

Can it decode HEVC? 4K streams usually use HEVC (H.265) compression. Older or entry-level devices may lack the hardware to decode it smoothly, which shows up as stuttering or a black screen. The list of compatible devices is a useful reference.

Are the app and system up to date? Install app updates from the official store, and update the device’s system software too.

Has the app built up stale data? Clearing the app’s cache often cures freezes and an electronic programme guide (EPG) that refuses to refresh. Our guide to IPTV on Android TV, Google TV and Fire TV shows where to find the option on those platforms.

Is motion processing getting in the way? Many TVs apply motion smoothing, which can make films look oddly artificial or add visual glitches around moving objects. Try turning it down or off in the TV’s picture settings. Some streaming devices also offer an option to match the display’s frame rate to the content, which can cure regular judder on slow camera pans.

When the problem isn’t on your side

Sometimes you do everything right and still hit trouble. If several channels play perfectly while one keeps failing, or problems appear at exactly the moment your neighbourhood’s broadband slows down each evening, the cause probably lies outside your home.

For broadband issues, your internet provider is the right contact, particularly if speeds are consistently well below what your package promises. For problems with particular channels or with signing in, get in touch with the 4K Media IPTV support team through the contact page. Support is available by email in English, French and German. You’ll get an answer faster if you mention the device and app you’re using, the channel or programme affected and when it happened, a recent speed test result taken on or near the device, and what you’ve already tried.

Still stuck?

Start with the table at the top, then work through the quick fixes and the network changes. Most problems are gone well before the end of the list. If yours isn’t, the FAQ answers the common technical questions, and the setup guide walks through each device from scratch, which sometimes reveals a setting that slipped through the first time.