I had the same issue on my laptop Samsung Windows 8.1 i5 2.5GHz 6GB ram and Matrix 12V, started all configs from scratch and read all manuals again. I was facing some issues in parallel with my usb controllers and sounds breaking after some time also. Reading ASIO4ALL manual, noticed 2 recommendations:
● Set the power scheme to “Always On” (XP) or “High Performance” (Vista) in order to turn off Processor P-State switching! Advanced: Modify an existing power scheme so as to not switch CPU speed, because other power settings are not that critical.
● Turn off system sounds! While e.g. the Windows logon sound certainly will not be a problem, sound effects in response to button clicks, notifications etc. will mean that for the time they play, ASIO4ALL may be unable to initialize the audio device.
After I set the energy options to High Performance (Systems Sounds were deactivated already) did a reboot and seems the problem is gone (as well my USB setbacks). I´m not completely sure this can help everyone or every case, nor I had time to reproduce back the issue but I´m happy now...
Regards