Fire Stick users uncover surprise charges that may be costing you hundreds per year – but simple trick can prevent them

on Reddit, explained that they started seeing mysterious charges to their Amazon account after having their wife's sister and her husband move into their basement flat.

The Redditor told guests they shouldn't watch anything that required a subscription.

They added: "Last month I found an unexpected charge for Kids+, which Amazon agreed to reverse, but then it showed up again and I realised they had subscribed.

"They swear they didn't, so I chalked it up to Amazon error.

"But in the past four days I found two more subscriptions added to my account, and this time checking their viewing history I know for sure they did indeed watch shows that required Starz and Acorn TV subscriptions."

Subscriptions for Kids+, Starzplay and Acorn TV each cost £4.99/$4.99 per month - and add up to about £15/$15 per month.

Going unnoticed, these unexpected subscriptions could cost you up to £180/$180 over the course of a year.

"I wouldn't have realised except when they subbed to Acorn last night," the Reddit poster warned. "It sent me an email about my free trial starting up."  

They added: "I went down this morning and locked them [with a PIN] again."

Another user, in a separate Reddit , added that they too have had to cancel subscriptions they were accidentally signed up for.

"I’ve had to unsubscribe from so many Amazon channels that were automatically subscribed to when my dad clicked on something from one of those channels," they wrote.

"They auto renew each moth and [I] didn’t realise they were billing me for multiple channels for almost a year."