I have 3 WiSMs two of them (WiSM-a and WiSM-b) are seated on the CORE1 switch (6509) and the WiSM-c is seated on CORE2 also a 6509 .
One of the controllers from WiSM-a/b keeps rebooting let's called it Con-1a and Con-2b reboots but usually more than the other one the controllers (WiSM located on CORE2 never reboot .
Both COREs have the same software code. The WiSM have been online for about a year with 22.214.171.124 version and they never rebooted until 3 months from now so a Cisco Tech suggested upgrading to 126.96.36.199 but it keeps doing it .
""IOS (tm) s72033_rp Software (s72033_rp-IPSERVICESK9_WAN-M), Version 12.2(18)SXF9, REL"