Randomly fast or slow

[Sidmind]

One of my vintage watches has started to randomly have issue

For now I am just curious if my diagnosis is correct, I learned to service watches myself and fairly decent at it, but most likely will send it off as its a higher end vintage piece.

Back to the problem, it consistently runs 7 seconds slow other than at times once perhaps twice per week I will look down and it will be 15 to 45 minutes fast OR slow, mostly fast. I have only seen it slow 1 or 2 times, who knows that could be unrelated, the 15-45 minutes fast issue happens at least once per week, never more than twice, not to mention NEVER when on my watch timer under controlled conditions, it only seems to happen when I have worn it for a few days and not topped off on my usual daily manual wind, it seems as if when I manually wind it several times per day it happens less, but like all things random I can't pin point that as fact.

1-So In my newbie experience I think it is a hairspring that either has a spec of dust or oil which randomly gets stuck together, and then gets unstuck on its own? But in my experience oil is all or nothing, and once on a spring, it stays running fast until cleaned in one-dip? true???

2-Tangled hairspring that randomly gets tangled and just as random works itself out. I don't know much about what causes it or what fixes one.

3- Mainspring busted causing different tension during certain parts of the power reserve cycle, but I was not aware that this can cause random speed up or slow downs.

4- other?????


Thanks in advance, Kevin

[Sidmind]

edit: I asked a dumb question and figured out myself.
please delete post.

[Sidmind]

I finally figured out the real issue, a loose minute hand.