Had the same problems.
Contacted distributor.
No response.
Contacted again.
No response.
Contacted CME Pte. Ltd., no response.
Started reverse engineering.
As far as I have found out, the Velostat patches age in combination with the adhesives used in laminating the keyboard circuit, so does the silver conductive.
This keyboard just fades away and the controller board and firmware are not capable of handling this.