I run a vbulletin forum on a hostican shared server, and I'm experiencing a similar problem all of a sudden. They became very strict with memory limits in January, and plenty of people who weren't previously getting problems are now getting them.
I disabled most of my mods as well, but the problem persists.
I honestly think a change in hosting plan is the only way to go. Other than upgrading at hostican, I've heard good things about a VPS on knownhost, wiredtree, and rapidvps, but I'm still doing research. Best of luck to you.
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