Yes it happened pretty much every day usually somewhere between 1-3pm for us - it's not normally an issue as you can duck into a restaurant or gift shop, most of the time it stops after 15-30 minutes. It is a bit of a relief most of the time! My advice is try to do the Disney parks later on if you can (we stayed in a villa 40 mins away so couldn't go early and come back later to avoid the worst of the heat), the fast pass is $15 per person per day and you can buy it in the morning and start to 'stack' your rides using the app for afternoon / evening. You can book one every 2 hrs so one at 7am, & every 2 hours after the park opens, If you get it right you can stack one every 30-60 minutes from when you arrive in the afternoon. If you have any questions feel free to Pm me. You must do Guardians of the galaxy at epcot if you are into rides, its phenomenal - although you'll need to get on to a virtual queue at bang on 7am on the app (you don't have to pay, or if you choose to pay its about $12 one off fee as it's not included in the daily fast pass).