The Echo gives the following:
7 7.45 a6280d15e18b1c0d849664930754beda ok 1 1 0 0

I've checked with both my AV and my firewall, and there are no reports from mIRC causing problems. I was not able to find a place to add an exception within my AV for mIRC, but I confirmed one was present in my firewall.

I've noticed a trend with the crashes over the last two days, is that it will not crash overnight, from about 10PM on, I do not get any crashes at all. Come morning, between 8 and 9 AM, even if I left it on overnight with no issues at all, it will freeze at some point around that time and return to the 30-minute crashes.

I haven't done a reinstall yet... if the above doesn't give any useful info, I'll try that next.