I share my iPhone location with my girlfriend (obviously she does with me also) but when I Looked earlier it kept saying "location unavailable." so when I asked she went and turned the share location back on and said that Instagram probably turned it off whenever she didn't want it to know her location.
So I guess I'm just wondering if any third party applications can do that or if it has to be done manually
Read more: Can anything other than the person themselves turn off their location sharing?