lapack function cpbtrs slower in mkl 18.0 vs 14.0

Hi,

I am experiencing a slowdown of cpbtrs function in mkl 18.0 comparing with mkl 14.0. My system is a Xeon E3-1240 v3 

The following (single-threaded) code seems to run more than 2x slower with 18.0:

         niter = 100000
         n   = 60
         nbd = 11
         ldb = 181

         allocate(a(nbd*n,niter))
         allocate(b(ldb,niter))

         a = cmplx(0.1,0.1)
         b = cmplx(0.5,0.5)

         do iter = 1 ,niter
            call CPBTRS('U', n,nbd -1, 1, a(:,iter), nbd, b(:,iter),ldb, status)
         enddo

The linking command that I used with ifort 18.0:

$INTEL_HOME/ifort -I$MKL_HOME/include/ cpbtrs.f90 
-Wl,--start-group -Wl,-Bstatic -L$MKL_HOME_LIB/lib 
-lmkl_core -lmkl_intel_lp64 -lmkl_intel_thread -lmkl_lapack95_lp64 -liomp5 -Wl,--end-group