waldorf freezing completely on toshiba z930

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http://crunchbang.org – Waldorf is freezing completely on toshiba z930 on an intermittent basis.  Passage of time will not resolve the issue, I have to use the power off button. The specifications for the laptop are presented in this link:http://www.toshiba.ca/web/product.grp?s ... part=13950bash-4.2# lspci 00:00.0 Host bridge: Intel Corporation Ivy Bridge DRAM Controller (rev 09) 00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) 00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host Controller (rev 04) 00:16.0 Communication controller: Intel Corporation (HowTos)