Are you using different controlCards from TI?
Depending on the controlCard that you use, TI has placed crystals of different values.
For instance R1.1 (ZJZ), has a crystal of 20MHz while R1.0 (PGF) has a crystal of 30MHz.
This can be seen in the schematics for the different controlCards that you can find in controlSuite. On my machine here are the paths:
For R1.0: "C:\ti\controlSUITE\development_kits\~controlCARDs\CC2833xHWdevPkg\F28335controlCARD HWDevPkg PGF [R1.0]\F28335 PGF controlCARD Schematic.pdf"
For R1.1: "C:\ti\controlSUITE\development_kits\~controlCARDs\CC2833xHWdevPkg\F28335controlCARD HWDevPkg ZJZ [R1.1]\F28335controlCARD-Schem[R1.1].pdf"
You need to reflect the correct crystal value for your boards in the configuration parameters of your model under "Hardware implementation > Hardware board settings >Target hardware resources > Clocking > Oscillator clock (OSCCLK) frequency in MHz" and make sure that the "Achievable SYSCLKOUT in MHz" matches your desired CPU frequency (ideally 150MHz).
A wrong crystal value entered in the configuration parameters leads to the type of behaviors that you are describing.
Let us know if this helps,