I own 3 JetKVMs, of which two of them stopped working, one of which doesn't boot at all and the other that never connects to network. The third I took out of service because the keyboard wouldn't send input when it was connected for more than a couple months. I'm sure the newer hardware is better, but I'm very unhappy with my JetKVMs.
I have two and one stopped working, but they were great and sent me a replacement motherboard and a toolkit to swap it over. Did you try reaching out to them?
FWIW, I have two JetKVMs from the original Kickstarter campaign, and both have been in continuous use since the day I received them without a single issue. So the experience definitely varies.
At least you got them. I'm still at the "We will send you an email to do a final shipment confirmation once ready" stage.
I've had good experiences with mine, only thing is that wifi and ethernet claims the same IP which causes my Unifi controller to freak out and send alerts