10gb is large how much ram you running? Thing to do is if you think it is mq2, load core plugins only, unload mq2melee, mq2cast, mq2moveutils, mq2advpath, mq2nav, mq2navigation, mq2notepad, mq2map, mq2linkdb. and lots more but basically just the chat window and that should be it and load all 6 toons in with just the core plugins and add additional plugins till you crash and then let redbot know the plugin and what issue with it your having.
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or if you are not able to reproduce the issue, in the mq2 folder is a crash dump, can send that to redbot and he might be able to point you in a direction to fix the issue. But the tried method for finding out your crash issue is to do like i said, load core plugins and try to produce the crash, if no crash load 1 more plugin and try again. Rinse and repeat till you find the trouble plugin. 99% of the time it is a custom plugin outside of the core that has an issue.