Wi-Fi fine by day but buffering every evening, with "Poor connection" on calls? Find out if it's your home network or your provider, and how to fix both.
During the day, everything is quick. Then, from around 7pm, Netflix starts buffering, games lag, video calls show "Your internet connection is unstable" or "Poor network connection", and web pages take an age. By the time everyone's gone to bed, it's fast again.
Evening slowdowns have two possible causes: your home network is overloaded because everyone's at home and online, or your provider's network is busy because the whole street is online. The fixes are completely different, so the first job is working out which it is.
Quick answer
Run a speed test on a laptop plugged into the router with a cable, once in the morning and once in the evening. If the wired speed drops a lot in the evening, it's your provider's network, so contact them with your results. If wired speed holds up but Wi-Fi slows, it's your home network: move devices to 5GHz, pause big background uploads and updates, and consider QoS or mesh.
Why This Happens
Your Home Network Is Busy
In the evening, everyone's home. Several TVs are streaming, phones are uploading photos, consoles are downloading game updates, and laptops are backing up. Each device competes for the same broadband connection and the same Wi-Fi airtime. Older routers struggle to share fairly between lots of busy devices.
Your Neighbours' Wi-Fi Is Busy
In flats and terraces, dozens of neighbouring Wi-Fi networks share the same airwaves. When they're all in use, especially on the crowded 2.4GHz band, everyone's Wi-Fi slows down.
Your Provider's Network Is Busy
Broadband providers share capacity between many customers, on the assumption that not everyone uses it at once. This is sometimes called contention. If a provider's local network doesn't have enough capacity, everyone in the area slows down at peak times, typically from early evening until late.
Step 1: Work Out Where the Problem Is
- Plug a laptop into the router with an ethernet cable and turn its Wi-Fi off.
- Run a speed test (your provider's own test, or a well-known one such as Speedtest by Ookla or fast.com) in the morning or early afternoon. Note the result.
- Run the same test, from the same laptop and cable, between 8pm and 10pm.
- Repeat on two or three different days. While you test, pause streaming on other devices if you can.
- Then do the same with a phone on Wi-Fi, standing in the room where you notice the slowdown.
- Wired speed drops a lot in the evening: it's your provider's network, or something in your house using the connection heavily. Check Step 2, then Step 5.
- Wired speed is fine, Wi-Fi is slow: it's your Wi-Fi. Work through Steps 2 to 4.
Step 2: Find the Bandwidth Hogs
A single device uploading or downloading heavily can slow everyone else. Common culprits:
- Cloud photo and file backups (iCloud, Google Photos, OneDrive, Dropbox) uploading large videos. Uploads are particularly disruptive because most UK broadband has much less upload than download capacity.
- Games console downloads and updates, which can be very large.
- Windows and Mac updates on several computers at once.
- Security cameras uploading recordings to the cloud continuously.
Your router's app (such as My BT or the Virgin Media Connect app) or settings page usually shows connected devices, and mesh apps often show which ones are using the most data. Schedule large downloads and backups overnight: most consoles can download updates in rest or standby mode, and Windows lets you set active hours in Settings > Windows Update > Advanced options.
Step 3: Use the 5GHz Band
The 2.4GHz band is crowded, especially in flats and terraced streets, and it gets worse in the evening when neighbours are online. The 5GHz band has many more channels and suffers far less interference.
- If your router shows two network names, connect phones, laptops and TVs to the 5GHz one where the signal is good.
- Leave 2.4GHz for smart plugs, bulbs and devices further away. Our guide on 2.4GHz and 5GHz explains how to split the bands on BT, Sky and Virgin Media hubs.
- If you can't split the bands, make sure the router isn't hidden away, which pushes devices onto the slower 2.4GHz band.
Step 4: Consider QoS and Better Kit
QoS (Quality of Service) is a router feature that prioritises certain devices or activities, such as video calls or a work laptop, over less urgent traffic like downloads. Many ISP hubs have limited or no QoS settings, but most mesh systems and good third-party routers have a simple version, often called device prioritisation. Look in your router or mesh app for a setting with that name.
If your router is several years old and you have lots of devices, a modern mesh system with Wi-Fi 6 or newer handles busy evenings far better. See Is Mesh Wi-Fi Worth It? and, if you're adding one to an ISP hub, how to set it up without double NAT.
Plug in anything that doesn't move. A TV, games console or desktop on an ethernet cable frees up Wi-Fi airtime for everything else, as well as getting a faster, steadier connection itself.
Step 5: Take It Up With Your Provider
If wired speed tests consistently drop in the evening, and nothing in your home is hogging the connection, it's time to contact your provider. Have ready:
- A list of wired speed test results, with dates and times, morning and evening.
- Confirmation that the tests were on a cable, with other devices paused.
- Your package's advertised speed.
Many UK providers have signed up to Ofcom's voluntary code of practice on broadband speeds, which gives you a minimum guaranteed speed and a route to resolve persistent problems. Ask your provider what your minimum guaranteed speed is, and what happens if it's not met. If the problem is local network capacity and isn't resolved, it may be worth looking at other providers or full fibre options at your address.
When to Get Help
If you're not sure whether it's your Wi-Fi, your devices or your provider, we can find out. Our home Wi-Fi and networking service tests the line and the Wi-Fi, identifies what's hogging the connection, and sets up prioritisation, mesh or cabling where it helps. Many checks can be done through remote support. Senri Home engineers visit across West and South West London seven days a week, 8am to 9pm, including evenings, which is handy for this particular problem. Book a visit or call or WhatsApp 07826 399715.
Related Reading
Common questions
Either your home network is busier because everyone's online, or your provider's local network is congested at peak times. Testing with a laptop plugged into the router at different times tells you which.
Usually, yes. The 2.4GHz band is crowded with neighbouring networks, especially in flats and terraces, while 5GHz has more channels and less interference. It has shorter range, so it works best in rooms near the router or a mesh unit.
Collect wired speed test results from mornings and evenings over several days, then contact your provider. Ask about your minimum guaranteed speed, and if problems persist, consider switching provider or technology.
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