Q: My Mac Book Pro freezes and reboots: here the crash log

My Mac Book Pro Retina 13inch - early 2013 - 3 GHz Intel Core i7 - 8 GB 1600 MHz DDR3 - OS 10.10.2 - very often (2 or 3 times a week) suddenly freezes and turns off.

I believe I was able to isolate in the console the event that happened right before:

10/02/15 09:35:32,181 TOCGenerator[4842]: WARNING: The Gestalt selector gestaltSystemVersion is returning 10.9.2 instead of 10.10.2. Use NSProcessInfo's operatingSystemVersion property to get correct system version number.

Call location:

10/02/15 09:35:32,181 TOCGenerator[4842]: 0   CarbonCore                          0x94fbc7c7 ___Gestalt_SystemVersion_block_invoke + 135

10/02/15 09:35:32,181 TOCGenerator[4842]: 1   libdispatch.dylib                   0x95ab5130 _dispatch_client_callout + 50

10/02/15 09:35:32,181 TOCGenerator[4842]: 2   libdispatch.dylib                   0x95ab50b5 dispatch_once_f + 251

10/02/15 09:35:32,181 TOCGenerator[4842]: 3   libdispatch.dylib                   0x95ab60d8 dispatch_once + 31

10/02/15 09:35:32,181 TOCGenerator[4842]: 4   CarbonCore                          0x94f4ee88 _Gestalt_SystemVersion + 1050

10/02/15 09:35:32,181 TOCGenerator[4842]: 5   CarbonCore                          0x94f4ea39 Gestalt + 150

10/02/15 09:35:32,182 TOCGenerator[4842]: 6   TOCGenerator                        0x000023da -[AppDelegate applicationDidFinishLaunching:] + 28

10/02/15 09:35:32,369 com.apple.xpc.launchd[1]: (com.hp.help.tocgenerator) Service only ran for 0 seconds. Pushing respawn out by 10 seconds.

The event above happens continuously while my Mac works.

I ran an extended test with AHT, but no problems were found

thanks in advance for your help

Luca