Cistern cough and making strange noises after flushing All aspects of plumbing questions and answers, help, tips and information

[danielson81]

Hi,

Don't know if you can help, every now and then after flushing my toilet makes a strange noise. Like its coughing, however if I lift the lid to the cistern up, it stops. It also stops if I flush again.

A video is here , its louder towards the end.
https://streamable.com/8r8jmq

Image of inside the cistern is enclosed if its any use.

Thanks, Dan