I have had no problems with it except when someone changed their name on Instagram. I accidentally deleted that person and upon trying to add them back nothing happened. I found out later that they had changed their name and upon putting in the correct name it was back with a lot of new images and videos. It seems it doesn’t have the ability to know when someone changes their name, so if you haven’t seen any new images or videos from someone then they have either changed their name or stopped using the app.
I don’t have it run all the time, just one time a day or so. It is much easier to run it when I see someone on Twitter post an Instagram picture since Twitter stopped support for them.