I have used many different grid notebooks, pens and inks and usually experienced a common problem: after the initial 75% or so of the page, I experience a progressive loss of 'bite' or ability to put ink on the page. It's hard to describe and feels like a combination of drying up and/or waxiness in the paper. Occasionally accompanied by feathering.
I have thought this might be due to oils from my hand transferring to the paper as I wrote but experiments involving starting to write at the foot of a fresh page were inconclusive.
More or less true for Clarefontaine, Rhodia, Maruman and Miquelrius grid paper as well as cheaper alternatives. True for Waterman, Diamine, Parker, Pelikan and Sailor ink in Pelikans, Parker Vacumatics and Sailor pens, amongst others.
Any thoughts on what's happening? Do others experience something similar?