After five straight wins to open the season, Toronto has dropped two straight. Jeremy Brevard USA TODAY Sports

The Toronto Raptors got off to a hot start in 2014-15 with a stellar offense that outpaced opponents and set the nets on fire. But 2015-16 has been a different animal for coach Dwane Casey's team, and there's a new problem in Toronto.

After the Raptors' loss on Sunday to the Miami Heat, Casey told reporters that he's more concerned with how Toronto has looked on offense than defense:

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"We have to execute offensively," head coach Dwane Casey said. "We have established ourselves defensively but they made some tough three's. (Hassan) Whiteside had a big game with 20 points, which is out of the norm for him. But we will bounce back. We're going to go back home and we will get back to work and bounce out of this.

"I didn't get too excited when we were 5-0 and I'm not getting down now after a few stinkers," Casey added. "We are somewhere in the middle."

Of course, the Raptors could be in trouble on defense, too, if DeMarre Carroll is out for any length of time with plantar fasciitis in his right foot. But Casey's point is especially poignant after Toronto managed just 76 points against Miami. The Raptors have failed to surpass 40 percent shooting in either of their losses this season.

On the bright side, however, Toronto did enter Sunday night as a top-10 unit on both offense and defense, when adjusted for pace.