Update on this: It also causes the system to crash apparently. It did not crash previously, before the KVM, and now it has a few times while connected to the KVM and writing to a umass device. I am doing a massive rsync/rsnapshot at the same time to a umass device.
I'm going to try it without the umass writing and see how long I can get, I guess, to see if that is some how causing a conflict. Here's those kernel messages: Aug 2 09:55:34 honey /bsd: uhidev2: Microsoft Microsoft Wireless Optical Mouse\M-. 1.0A, rev 2.00/0.17, addr 4, iclass 3/1 Aug 2 09:55:34 honey /bsd: uhidev2: 2 report ids Aug 2 09:55:34 honey /bsd: ums0 at uhidev2 reportid 1: 3 buttons and Z dir. Aug 2 09:55:34 honey /bsd: wsmouse1 at ums0 mux 0 Aug 2 09:55:34 honey /bsd: uhid0 at uhidev2 reportid 2: input=1, output=0, feature=0 Aug 2 09:56:13 honey /bsd: uhidev2: at uhub5 port 4 (addr 4) disconnected Aug 2 09:56:14 honey /bsd: wsmouse1 detached Aug 2 09:56:14 honey /bsd: ums0 detached Aug 2 09:56:14 honey /bsd: uhid0 detached Aug 2 09:56:14 honey /bsd: uhidev2 detached Aug 2 09:58:50 honey nagios: Auto-save of retention data completed successfully. Aug 2 10:09:44 honey /bsd: uhidev2 at uhub5 port 4 configuration 1 interface 0 Aug 2 10:09:44 honey /bsd: Aug 2 10:09:44 honey /bsd: uhidev2: Microsoft Microsoft Wireless Optical Mouse\M-. 1.0A, rev 2.00/0.17, addr 4, iclass 3/1 Aug 2 10:09:44 honey /bsd: uhidev2: 2 report ids Aug 2 10:09:44 honey /bsd: ums0 at uhidev2 reportid 1: 3 buttons and Z dir. Aug 2 10:09:44 honey /bsd: wsmouse1 at ums0 mux 0 Aug 2 10:09:44 honey /bsd: uhid0 at uhidev2 reportid 2: input=1, output=0, feature=0 Aug 2 10:12:00 honey /bsd: uhidev2: at uhub5 port 4 (addr 4) disconnected Aug 2 10:12:01 honey /bsd: wsmouse1 detached Aug 2 10:12:01 honey /bsd: ums0 detached Aug 2 10:12:01 honey /bsd: uhid0 detached Aug 2 10:12:01 honey /bsd: uhidev2 detached Aug 2 10:32:31 honey /bsd: uhidev2 at uhub5 port 4 configuration 1 interface 0 Aug 2 10:32:31 honey /bsd: Aug 2 10:32:31 honey /bsd: uhidev2: Microsoft Microsoft Wireless Optical Mouse\M-. 1.0A, rev 2.00/0.17, addr 4, iclass 3/1 Aug 2 10:32:31 honey /bsd: uhidev2: 2 report ids Aug 2 10:32:31 honey /bsd: ums0 at uhidev2 reportid 1: 3 buttons and Z dir. Aug 2 10:32:31 honey /bsd: wsmouse1 at ums0 mux 0 Aug 2 10:32:31 honey /bsd: uhid0 at uhidev2 reportid 2: input=1, output=0, feature=0 Aug 2 10:34:25 honey /bsd: uhidev2: at uhub5 port 4 (addr 4) disconnected Aug 2 10:34:25 honey /bsd: wsmouse1 detached Aug 2 10:34:25 honey /bsd: ums0 detached Aug 2 10:34:25 honey /bsd: uhid0 detached Aug 2 10:34:25 honey /bsd: uhidev2 detached Aug 2 10:49:26 honey /bsd: uhidev2 at uhub5 port 4 configuration 1 interface 0 Aug 2 10:49:26 honey /bsd: Aug 2 10:49:26 honey /bsd: uhidev2: Microsoft Microsoft Wireless Optical Mouse\M-. 1.0A, rev 2.00/0.17, addr 4, iclass 3/1 Aug 2 10:49:26 honey /bsd: uhidev2: no report descriptor