[jeffn1]

Many Bluetooth devices have a 'timeout' built in to save battery, but from the Amazon listing, this doesn't seem to have one.
Even so, 15 seconds would be a ridiculously short duration!
I suggest contacting the manufacturer, and quickly...while you can still return it if necessary.

EDIT:

After reviewing the manufacturer's website, I'd say if it doesn't work right from the get-go, you are screwed...support seems to be non-existent.
Return it if you can.

I have tried this on three separate tablets with the same result, time to drop off varied from 10 seconds to 30 seconds, but same happened on all three.
Fortunately I bought this from Amazon so have used their returns policy and sent it back for a full refund.
The pedal itself looked solid enough and I suppose for those that got one that worked it is good value, i may have just been unlucky.

I had drop out problems when I tried bluetooth pedals.  I gave up on bluetooth and went back to a wired Billipro.  I have been satisfied with it.