Print quality worsens after the first few layers

Hi all

I have a Wanhao I3 Mini and I've started to have this problem on pretty much all of my prints.
The first few layers are perfect.

Perfect connection to the bed, no space between walls and infill and then gradually it looks as though the nozzle comes too close to the print.
The wheel that pushes the filament starts to click and the higher the print, the worse the quality.
What could cause this?

Thanks.

Attachment 12991Attachment 12992

There are many things that could cause the problems you are experiencing.
Slicer and 3DPrinter setting conflicting, Hot-end temperature incorrect for filament, printing too fast, 3DPrinter not properly maintained and lubricated.

It could help it you supplied more information, Slicer settings, 3D Printer temperatures, Print Speed, type of Filament used.
Supping a link to a video uploaded to a share site like google Drive or You-tube can come in handy.