I had upgraded both PCs (I have a 1+4 setup on 2 PCs) to 1.8j last week and had no problems on either PC over the first couple of sessions.
However, this week I've been playing a lot more multiboxing and the second PC has stopped responding to keyclone numerous times.
It usually happens when I send all 5 voidies into attack, only my main voidy attacks, the 4 on the second PC sit twiddling their thumbs and we wipe

When I tab out I see that KeyClone on my main PC is no longer showing a connection to the second PC and will not reconnect.
When I check out KeyClone on the second PC it has not died, it still responds to being brought into focus, but I have to close it, kill the remaining KeyClone process and fire it up again before my main PC will connect again and we can continue.

It happened 3 or 4 times in the last couple of days, so I've ended up rolling the second PC back to 1.8f (the previous version I had on that system) whilst sticking with 1.8j on the main PC.

I can't determine any patterns to point to a cause. The second PC is only ever used for multiboxing and both PCs are cabled into the same router (no wireless anywhere here).

I've now had 2 days, with long "get to 60 and get epic mount" sessions using 1.8j + 1.8f, with no repeat of the problem.

If there's anything I can do to help pinpoint the issue, just shout.