Fault on my fork was that they more or less seized up. they did lose pressure but not much.
After 2 rides there was a grey film on the stantions which was hard to rub off, i’d clean them up & squirt some silicon lube on them but after the next ride they would seized up again. Replacement fork has been fantastic in comparison.
Did get fobbed off a bit by Halfords a bit, stuff about running the right pressure in them blah blah blah but got there in the end, you just have to dig in and be a ****, they cave in the end.