Do you rinse between the iodophor and the Starsan? Neither needs to be rinsed or causes an off-flavor, but I wonder if the you are not rinsing between the two, if the two chemicals are causing some kind of reaction?
The other issue and "sour" being the key is an infection, possibly a lactobacillus bug? You may want to replace all tubing you use and soak everything else in bleach. When you made the strawberry wheat did you use real strawberries? If so, maybe picked up an infection from them?
Member of the Metro South Homebrew League (Mash-Holes) - Weymouth, MA 2015 Mash Holes Brewer of the Year
Primary - Dank Knight Rises Black IPA
Kegged - Jane Rae's Amber Ale, Azacca Pale Ale