I have the MATIAS quiet version and also have the character repeating problem on 'd', 'tab' and 'caps lock' keys. The problem cannot be solved by just popping the keycaps off and put them on. Disassembling the switch, cleaning and repositioning the switch contacts solves the problem, but this is not something average users want to do. In summary, It's the MATIAS switches that have some QC issues.