I had the same problem with the hi-hat. I found the problem to be on a small circuit board below the cymbaL I send e-mail the 2box team and asked where can I buy a new circuit board? The responsibility came the same day:
""Hi,
We can ship a new one from Sweden.
Price is 19:90€ including freight.
Pay to PayPal invoice@2box.se
Regards
Team2box""
The post office delivered the letter in five days. I changed the part and now it works fine!
Great service!
(Sorry for the bad English but luckily there is a Google translator!)