Hi, I may have just found a workaround. I had the same problem, as you, and many others, and yesterday I probably got nine segment alerts in less than 50 feet of a run. Not sure if it works yet because I haven't used it in a real workout, but I remembered this ...
"Please for all that is holy give us the option to disable segments!," and couldn't agree more!
It's not perfect and I don't know if it will work if you're looking for exact times. I've tried it with Outdoor Walk and Outdoor Run, but not in a real workout, yet.
Go to Outdoor Walk or Run and open it.
Then hit the side button, not the crown dial. It takes you to the control screen.
Hit the water drop. It locks the screen.
To unlock the screen when you're done, hold the crown, and it will do that water ejection thing.
I won't know if it will give mile splits until tomorrow, I sure hope it does. My apologies if it doesn't work and I've wasted your time. I just remembered your post when I was trying to solve this yesterday after getting so many segment alerts that I wanted to slam my watch into the ground. It all happens because of my wet sleeve, it doesn't happen in the summertime.
Hope it helps, Tim