I also blame Corbin. After a rough 1st half of his rookie season, Hayward has generally been pretty good, starting off a little slowly each season, but then getting better as the year progresses. His career avgs were around 45%/40%.
He's then asked to do everything early in the season with no PG and the numbers fall. Clearly, he's not Kobe nor LeBron. So what should be the solution? Back off. Let him be a wing, but don't ask him to be the primary playmaker, especially with Burke on the team. This is absolutely a coaching problem. It's plain to everyone BUT Ty that Gordon is struggling in his expanded role. Gordon has increased his rebounding rate. He's upped his steals average. Just back off on having him try to be a creator on offense and I think his shooting will come back.
Also have to wonder after that hot streak whether his hip is still bothering him. He came out of his slump, caught fire, then was out and has played horribly since.