Could these symptoms be autoimmune related?

[Dmeck]

I am an active woman participating in boot camp classes 4-5 days a week.  Over the past few months I have had 3 random instances of intense pain at my knee and elbow that will disappear within 5-6 hours.  The pain starts during my sleep and will wake me   It will hurt all morning, then subside until it just feels like a bruise to the touch.  The first was my elbow right at the tricep insertion, with no injury noted. It hurts to range the joint and very painful to touch.  The second was my knee. It woke me with an intense throbbing and also very painful to touch. The painful spot was lateral aspect of patella.  The elbow returned again, for the third episode.   The pain is so intense that it hurts to move the elbow or knee when I rise in the morning. It will then subside to a tenderness to touch by days end.   Very random.  Any ideas?

[AndRynne]

Bursitis due to minor boot camp trauma?

[Dmeck]

But it goes completely away by end of day as if it never happened.  That's the confusing part.