My WiFi crashes randomly and I need to reboot to get it working again

So I got my Macbook Pro 15" late 2011 repaired two weeks ago. After that the Laptop worked okay and after a few days I upgraded to 10.9.3 (from 10.9.1) and now my WiFi crashes randomly. It just stopes working. It doesn't find the network anymore and if I try to switch it of and on again, it won't go on anymore. The only way to fix this is to reboot the whole machine. This happens pretty randomly.
Currently I don't know if the repairs (Apple switched the logic board) is the problem or if there is a bug in the Mac OS that creates this.
Has anyone else have the same issue on their Mac OS 10.9.3 ? How do I find out if this is hardware related? Rebooting helps, so for me this is not an obvious hardware failure, but what do I know
Bodo

Is it Wifi or USB?
Open console in Applications>Utilities, check the system log for the date/time of the last problem  & the Startup right after that for clues.

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