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The majority of failed friction hinges that I see is down to neglect.
An occasional clean off with a stiff paintbrush to remove dust and spiders webs. Followed by some silicon spray for the frame track where the slider goes up and down and around the top cap. Some 3in1 oil for the hinge pivot points.
Whilst your at it, give the locking mechanism a squirt of 3in1 as well.
user69121-
Maybe you intended this for @Quincy; regardless, my guess was related to what can happen around here where we have soils with high expansive clay content and wildly fluctuating temps and precipitation.
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We have a similar problem with 3 windows not closing. On side hung windows there is a 3-4 mm gap at the bottom on the hinge side, no gap a the top. The hinges are easy clean models that can open very wide. This type
https://www.windowware.co.uk/index.php/catalog/product/view/id/28218/The plastic locating lug seems to have worn away. I can see what the problem is but have no idea how to take out old ones and replace with new.
They have only been in for 8 years but the house was rented out while we were overseas in 2016/17 so anything could have happened. Further complications are that the builder who did the work has retired and the company that made the windows has gone out of business so they cannot help us.
withered_preacher
Charlie_L
Don't know about where you live, but around here houses can settle causing windows to stick and not work properly.