I’m frustrated

Alesis Sample Pad restarts randomly

I have Alesis Sample Pad and everything works fine except that the unit restarts randomly while playing. Sometimes it's after 2 minutes, sometimes after 5 mins but it happens every time I play. I tried factory reset but it did not work and Sample Pad still restarts randomly so it creates an interruption of 5-10 seconds until it turns on again and loads the samples.
It started happening right from the start (after I purchased it) but I did not return the unit at that point, so I am out of warranty now.
Any ideas what the cause might be and what to do?
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