On Thursday, 28 January 2021 at 23:52:26 UTC, ss wrote:
Samsung printer ML-2240.
If I load up with say 100 sheets x A4 it will print ok around 75 pages
then it stops picking up the paper, If I top up the paper again to 100
sheets it starts picking up again and stops around the 75 sheet count.

Any thoughts on what to check on?

An outside possibility that which way up you are using your paper is making a small difference. I have seen it do so on some printers.