This morning while playing in the RTTY 'test, I answered a CQ by sending my call nine times (3 bursts of 3). 100W power. The antenna is at 1.0:1 SWR. *CLICK* and the K3 powered off. I wasn't watching it, so didn't see any error message. Vague I know, but it's all I have. Any thoughts? 73 Mike NF4L