Didn’t know where to post this, but this seemed the best place. I’ve been having a sore knee every now and then for a long time now. I mostly have it when i’m walking somewhere, stand up for a long time or the day after exercising. It’s not extremely painful, just sore, but sometimes it collapses (like it’s instable suddenly) for like a split second. Any advice? I don’t wanna go see a doctor ‘cause it doesn’t bother me extremely much, but i’d like to know if anyone has experienced this and knows what’s up?