have a problem with my etc express console 48/96........ It doesnt respond......the faders and the shows are working when i open.....after 4 with 5 hours it doesn't respond to any key......only if i turn it off.....and then when i open it it holds 15 s

  1.  have a problem with my etc express console 48/96........ It doesnt respond......the faders and the shows are working when i open.....after 4 with 5 hours it doesn't respond to any key......only if i turn it off.....and then when i open it it holds 15 seconds and then it stops again....what should i do?
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