Why Does My Internet or Broadband Keep Disconnecting?

By Paul Snyman · Published March 25, 2026 · Updated August 8, 2026 · 7 min read

Few things are more frustrating than an internet (or broadband, if that's what you call it) connection that works for a few minutes, drops out, reconnects, and drops again. Whether it's WiFi, a cable modem, or a DSL line, the cause isn't always obvious - it could be your router, your ISP, WiFi interference, or something else entirely. Here's a systematic approach to finding and fixing intermittent disconnections. If your connection shows as joined but nothing loads at all, rather than dropping intermittently, see our guide to "connected to WiFi but no internet" instead.

Common Causes of Intermittent Disconnections

Internet dropping in and out can have many causes. Understanding the most common ones helps you narrow down the culprit faster.

Router and Modem Issues

Your router is a small computer that runs continuously. Over time, memory leaks, overheated components, or firmware bugs can cause instability. If your router is more than 4-5 years old, age-related hardware degradation is a real possibility.

• Overheating - routers stuffed in cabinets or stacked on other electronics overheat and start dropping connections
• Firmware bugs - outdated firmware can cause random disconnections. Check your router manufacturer's site for updates
• Memory exhaustion - cheap routers with limited RAM struggle when too many devices are connected

ISP Problems

Sometimes the problem is upstream. Your ISP's network equipment, a damaged cable in your street, or congestion at peak hours can all cause intermittent outages that look like a local problem. On a DSL line specifically, electrical noise picked up along the copper phone line is a common cause of a connection that drops repeatedly, especially if it happens more during bad weather or at a consistent time of day.

WiFi Interference

WiFi operates on shared radio frequencies. Your neighbours' routers, Bluetooth devices, baby monitors, microwaves, and even USB 3.0 devices can all interfere with your WiFi signal. The 2.4 GHz band is particularly crowded in apartments and dense neighbourhoods.

DNS Failures

If your DNS server is unresponsive, your internet connection is technically still active but nothing loads - because your device can't translate domain names into IP addresses. This feels exactly like a disconnection even though the underlying connection is fine.

Network Overload

Too many devices downloading, streaming, or backing up simultaneously can overwhelm a router or exhaust your bandwidth. Security cameras uploading footage, cloud backups running, and someone streaming 4K can easily saturate a connection.

How to Diagnose the Problem with PingKit

Rather than guessing, use diagnostic tools to identify exactly where the problem is. PingKit gives you several tools specifically designed for this.

Connection Monitor: Track Stability Over Time

PingKit's Connection Monitor pings a reliable server in real time and graphs the results live while the app is open. Keep it in the foreground and watch the live graph and stability score - you'll see exactly when a disconnection happens and how long it lasts. For unattended tracking over hours or days, run Guardian's Mac Agent instead, which can watch your connection continuously from a Mac.

• Regular pattern (drops every 30 minutes) - suggests a router DHCP lease issue or a device reconnection cycle
• Drops during specific times (evenings, weekends) - points to ISP congestion or neighbourhood WiFi interference
• Random, unpredictable drops - could be hardware failure, overheating, or intermittent cable damage

Ping: Check for Packet Loss

Open PingKit's Ping tool and ping your router's gateway address (shown in My Network). If you see packet loss to your own router, the issue is between your phone and the router - typically WiFi interference or a router hardware problem.

Then ping an external server like 1.1.1.1 (Cloudflare). If you get packet loss to external servers but not to your router, the problem is between your router and the internet - likely an ISP issue.

MTR: Find Where the Problem Is

MTR combines traceroute with continuous ping to show packet loss and latency at every hop between you and a destination. Run an MTR to a reliable server like 1.1.1.1 and look for where packet loss begins:

• Loss at hop 1 (your router) - local WiFi or router issue
• Loss at hops 2-3 (ISP equipment) - problem on your ISP's network
• Loss only at the final hop - the destination server may be rate-limiting ICMP; not necessarily a real problem

Speed Test: Measure Bandwidth

Run speed tests at different times of day. If speeds are normal in the morning but terrible in the evening, ISP congestion is likely. If speeds are consistently low, there may be a physical line issue or a plan limitation you've forgotten about.

Fixing the Problem

Quick Fixes to Try First

1. Restart your router and modem - unplug both for 30 seconds, plug the modem in first, wait for it to fully connect, then plug in the router
2. Check for overheating - if your router is hot to the touch, move it to a well-ventilated spot
3. Update firmware - log into your router's admin panel and check for available updates
4. Switch WiFi channels - if you're on a congested channel, switching can dramatically improve stability
5. Change DNS servers - switch to Cloudflare (1.1.1.1) or Google (8.8.8.8) to rule out DNS-related drops

If the Router Is the Problem

• Factory reset the router and reconfigure it from scratch
• Reduce the number of connected devices if your router is overwhelmed
• If the router is old, consider replacing it - modern WiFi 6 or WiFi 7 routers handle more devices and offer better stability

If the ISP Is the Problem

When your diagnostics point to the ISP, gather your evidence before calling support:

• Screenshots of Connection Monitor's live graph and stability score showing the pattern of disconnections
• MTR results showing packet loss on their network hops
• Speed test results showing speeds well below your plan

This data transforms a "my internet keeps dropping" call into a factual, evidence-backed report. ISP support teams take these reports more seriously because you've already done the troubleshooting they would ask you to do.

When to Call a Technician

If you've tried everything above and the problem persists, there may be a physical issue that needs professional attention:

• Damaged cables - the coaxial or fibre cable running to your house could be damaged, corroded, or poorly terminated
• Faulty splitters - if your cable is split to multiple rooms, a bad splitter degrades signal quality
• Line noise - for DSL connections, electrical interference on the phone line causes intermittent drops
• Exchange congestion - in some areas, the local exchange is simply oversubscribed and needs ISP investment

Ask your ISP to send a technician to test the line at your premises. Have your PingKit diagnostic data ready to show them where the problem is occurring.