Do you get any other error messages before? MQ2, windows warnings or slow response from the computer when all 3 toons are running?
KernelBase crash will probably need to get mailed to eqmule. I think that's a core fail of MQ2 as opposed to a plugin or such that we could trouble shoot for you.
I do get KernelBase crashes on one of my computer's that is skimming the edge of it's memory capacity. I tend to get a windows warning about low memory, if I skip it and continue to run MQ2 it will eventually generate a KernalBase crash. If I reboot & restart everybody, they are back to fine for a few days. I have noticed the bard is the most likely to generate a KernalBase type crash, so I was wondering if it's mq2twist related, but I've never seen it call out that plugin as the problem.