Hi, I've been using omnipod since March. A couple did come loose in the summer when the temperature was at its highest.
I use skin prep by smith&nephew, £14.99 for 50 from Amazon. Wipe the area that you are applying the pod 2, it's makes the skin tacky and I have had no problems since using it. Been fine in warm weather, hot baths & the gym.
Hope this helps.