PHP SDK Silent Failures and Segfaults

Has anyone else had issues with large data sets with setmulti blowing up your apache process? We've had spotty issues where we have a setmulti hitting a 3 node cluster with about 56,000 records in the multiset. When doing all at once we've run into probably a dozen instances where the process stops executing, yet maintains large amounts of ram and shows no errors. We have the server mem max set to over 2 gigs and these bad boys look as if they have hit the max or close (2.1, 1.9gigs etc). Killing them logs a segfault in the log.

After splitting the setmulti into batches of 500 each, it seems to be fine. We're running the latest sdk versions as well with 1.8.1 servers..