Card machine problems: declines, crashes and dropped connections
Most card machine problems come down to one of four causes: connectivity, outdated terminal software, a fault with the acquirer rather than the device, or hardware reaching end of life. The fixes below resolve the first three in minutes; the fourth (and a provider that will not support you through any of them) is a reason to switch.
A card machine that fails during service costs real revenue: queues walk, and fewer customers carry cash as a fallback each year. Repeat failures deserve the same attention as any other cost in the business.
Why does my card machine keep declining payments?
A card machine declining every card is almost never about the cards — it is the terminal failing to reach the acquirer, or the acquirer rejecting the merchant connection. A single declined card is the customer’s bank; every card declining is your machine, your connection, or your account.
- Restart the terminal first. A surprising share of decline storms clear on reboot.
- Check connectivity: if the terminal is Wi-Fi-only and the router is struggling at peak, that is the fault. Terminals with 4G/SIM failover keep taking payments when broadband drops.
- Check for a provider outage — acquirers publish status pages, and outages typically hit every terminal on that acquirer at once.
- If declines persist with good connectivity, call the provider: account-level holds (failed direct debit, KYC review) silently stop authorisations.
Why does my card machine freeze or crash mid-transaction?
Freezing during a transaction usually means outdated terminal software or ageing hardware. Terminals receive regular software updates; a machine that has not updated (often because it is switched off overnight during its update window) accumulates bugs until it misbehaves. Leave the terminal on and connected overnight once a week to let updates apply.
If the terminal is several years old and freezes persist after updates, the hardware is the problem. Ask the provider about replacement terms — and if the answer involves a charge for replacing their own failing hardware mid-contract, weigh that against switching provider at renewal.
What should I expect from my provider when things go wrong?
The realistic standard: support that answers quickly (including evenings and weekends if you trade then), next-day replacement of failed hardware, and settlement that is not delayed by the fault. A provider that misses all three repeatedly is costing more than any headline fee saving.
When a fault costs you a busy service, log it: date, duration, what support said. A short log turns "the machine keeps playing up" into evidence — useful for a complaint, for exiting a contract on service grounds, and for choosing the next provider.
When is it time to switch card machine provider?
Switch when failures are recurring rather than one-off, when support cannot resolve them, or when the hardware is end-of-life and the provider wants you to fund its replacement. Check the notice period and any exit fee in your contract first — cancellation terms decide whether switching now or at renewal makes sense. Our cancellation guides cover the mechanics for each major provider.
What does a reliable setup actually look like?
Put a number on it before you accept an apology. Dojo reports 99.99% platform uptime since February 2022, which is the sort of published figure worth asking any provider for; most will not give you one, and that answer is itself informative.
The cost of failure is easier to size than people expect. A bar taking £2,000 across a six-hour Friday session loses roughly £330 of trade for every hour the terminal is down, and that is before the customers who do not come back. Against that, a 0.2% rate difference on £15,000 a month is £30. Two failed sessions a year outweigh the rate argument entirely.
Money missing is usually settlement rather than the machine, and that has a number too. Next working day including weekends is what Dojo publishes; two to three working days is common elsewhere. On £20,000 a month that is roughly £1,300 of your own money in transit at any moment instead of £650. Hardware is the last line: without replacement cover, a replacement terminal is charged at around £176 plus VAT.
A last check before you accept that a terminal is simply old. Dojo publishes 99.99% uptime and a next-day replacement, and review sites checked in August 2026 report terminal rental at £25 a month for the Go Max. Paying £25 a month for kit that fails twice a quarter is £300 a year for the privilege, and at that point the fault is the contract rather than the hardware.
If a provider will not fix it, the complaint route is real rather than decorative. Acquirers and payment institutions are FCA-regulated, they must run a formal complaints process, and a final response is expected within eight weeks. The Financial Ombudsman Service has covered small businesses since 1 April 2019, and it is free: a firm qualifies with annual turnover under £6.5 million plus either fewer than 50 employees or a balance sheet under £5 million.
Frequently asked questions
Why is my card machine declining every card?
When every card declines, the cause is the terminal, its connection, or the merchant account — not the customers. Restart the terminal, check its internet connection, then check the provider’s status page for an outage. If declines continue, call the provider: account-level holds can silently stop all authorisations.
Why does my card machine keep losing connection at busy times?
Busy-period drops usually mean the terminal shares congested Wi-Fi with everything else in the building. Fixes: move the terminal to a dedicated network or band, or use a terminal with built-in 4G/SIM failover so payments continue when broadband struggles.
Can I leave my card machine contract early because of faults?
Depends on the contract. Persistent, documented faults the provider fails to fix can amount to a service failure that supports early exit or a negotiated release — keep a log of every incident and support contact. Otherwise, exit is governed by the notice period and any remaining-term fees. Check the contract before assuming either way.
Do I lose money while my card machine is down?
Usually, yes — most walk-in businesses cannot recover sales lost while unable to take cards. That is why support speed and hardware replacement terms matter as much as transaction rates when comparing providers, and why a terminal with mobile-data backup is worth having where card sales dominate.
Sources
Provider claims, regulator directions and the Ombudsman size test, checked August 2026.
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CapExpand Ltd · Company No. 14433858 · ICO ZB789649 · Annesley, Nottingham
CapExpand Ltd (Company No. 14433858) is an authorised Dojo partner, not a card machine manufacturer. Card machine pricing and availability are subject to change. Our card machine services are not regulated by the Financial Conduct Authority and fall outside our appointment as an Appointed Representative of White Rose Finance Group Limited, which covers credit broking only.