It is a physical problem with the key. You can fix it by disassembling the key and cleaning the contacts: Original guide - https://imgur.com/a/elAFF#0 https://

It is a physical problem with the key. You can fix it by disassembling the key and cleaning the contacts: Original guide - https://imgur.com/a/elAFF#0 https://imgur.com/a/elAFF#0 Thread with context - https://www.reddit.com/r/MechanicalKeyboards/comments/2hjct6/help_opening_a_matias_switch/ https://www.reddit.com/r/MechanicalKeyboards/comments/2hjct6... However, this is really Matias's problem to resolve. Supposedly the switch or the assembly process has been redesigned to prevent this problem in the newest batch, but I don't know if it's a proven success.