If you have to repeat it 3-4 tunes, offhand it sounds like a sync problem (trying to use a resource before it’s fully loaded).
But that really will be impossible to troubleshoot without some code. Trying to figure this out from feeling around descriptions of the code is unlikely to be successful.
Btw memSize is only for the real time memory pool. Buffers don’t use the real time pool, so memSize is irrelevant for Buffers.
hjh