Disklavier

Good morning to everyone,

after 3 years of work my PRC-100 is dead. I was using it to command my DC3 Pro when the screen freezed and no key worked anymore.
I tried to resume it disconnecting the battery and connecting again, but it never starts again.

I'm trying to get assistance from Yamaha but I believe that after 3 years there is no other way than to buy a new one.

I arrange myself with the Iphone applet, but it has not all the features and the need for a Wi-Fi connection is a limit for my network, so I would explore a way to make this PRC working.

Has anyone experienced this failure?
Is there a way to repair this.... obsolete device?
How much could cost a new one?

... suggestions?

many thanks in advance,

Roberto